61638001 has 4 divisors (see below), whose sum is σ = 61657252. Its totient is φ = 61618752.

The previous prime is 61637941. The next prime is 61638007. The reversal of 61638001 is 10083616.

61638001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49914225 + 11723776 = 7065^2 + 3424^2 .

It is a cyclic number.

It is not a de Polignac number, because 61638001 - 2¹¹ = 61635953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61638007) 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 3 ways as a sum of consecutive naturals, for example, 3540 + ... + 11653.

It is an arithmetic number, because the mean of its divisors is an integer number (15414313).

Almost surely, 2^61638001 is an apocalyptic number.

It is an amenable number.

61638001 is a deficient number, since it is larger than the sum of its proper divisors (19251).

61638001 is a wasteful number, since it uses less digits than its factorization.

61638001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19250.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 61638001 is about 7850.9872627587. The cubic root of 61638001 is about 395.0173597028.

The spelling of 61638001 in words is "sixty-one million, six hundred thirty-eight thousand, one".