61283521 has 8 divisors (see below), whose sum is σ = 69880104. Its totient is φ = 53241600.

The previous prime is 61283513. The next prime is 61283543. The reversal of 61283521 is 12538216.

61283521 = 5535² + 5536².

61283521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 24850225 + 36433296 = 4985^2 + 6036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61283521 - 2³ = 61283513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61283521.

It is not an unprimeable number, because it can be changed into a prime (61283591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138430 + ... + 138871.

It is an arithmetic number, because the mean of its divisors is an integer number (8735013).

Almost surely, 2^61283521 is an apocalyptic number.

61283521 is the 5536-th centered square number.

It is an amenable number.

61283521 is a deficient number, since it is larger than the sum of its proper divisors (8596583).

61283521 is a wasteful number, since it uses less digits than its factorization.

61283521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277331.

The product of its digits is 2880, while the sum is 28.

The square root of 61283521 is about 7828.3792064514. The cubic root of 61283521 is about 394.2586554317.

The spelling of 61283521 in words is "sixty-one million, two hundred eighty-three thousand, five hundred twenty-one".