61598921 has 4 divisors (see below), whose sum is σ = 61728000. Its totient is φ = 61469844.

The previous prime is 61598903. The next prime is 61598981. The reversal of 61598921 is 12989516.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61598921 - 2¹⁰ = 61597897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61598981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63821 + ... + 64778.

It is an arithmetic number, because the mean of its divisors is an integer number (15432000).

Almost surely, 2^61598921 is an apocalyptic number.

It is an amenable number.

61598921 is a deficient number, since it is larger than the sum of its proper divisors (129079).

61598921 is a wasteful number, since it uses less digits than its factorization.

61598921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129078.

The product of its digits is 38880, while the sum is 41.

The square root of 61598921 is about 7848.4980091735. The cubic root of 61598921 is about 394.9338584976.

The spelling of 61598921 in words is "sixty-one million, five hundred ninety-eight thousand, nine hundred twenty-one".