981875521 has 16 divisors (see below), whose sum is σ = 1131863040. Its totient is φ = 842371920.

The previous prime is 981875491. The next prime is 981875551. The reversal of 981875521 is 125578189.

It is an interprime number because it is at equal distance from previous prime (981875491) and next prime (981875551).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981875521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981875551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46036 + ... + 63898.

It is an arithmetic number, because the mean of its divisors is an integer number (70741440).

Almost surely, 2^981875521 is an apocalyptic number.

It is an amenable number.

981875521 is a deficient number, since it is larger than the sum of its proper divisors (149987519).

981875521 is a wasteful number, since it uses less digits than its factorization.

981875521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18156.

The product of its digits is 201600, while the sum is 46.

The square root of 981875521 is about 31334.8930267841. The cubic root of 981875521 is about 993.9216353412.

The spelling of 981875521 in words is "nine hundred eighty-one million, eight hundred seventy-five thousand, five hundred twenty-one".