981526721 has 16 divisors (see below), whose sum is σ = 1161484800. Its totient is φ = 811556928.

The previous prime is 981526717. The next prime is 981526723. The reversal of 981526721 is 127625189.

It is not a de Polignac number, because 981526721 - 2² = 981526717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981526723) 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, 410696 + ... + 413078.

It is an arithmetic number, because the mean of its divisors is an integer number (72592800).

Almost surely, 2^981526721 is an apocalyptic number.

It is an amenable number.

981526721 is a deficient number, since it is larger than the sum of its proper divisors (179958079).

981526721 is a wasteful number, since it uses less digits than its factorization.

981526721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4448.

The product of its digits is 60480, while the sum is 41.

The square root of 981526721 is about 31329.3268520088. The cubic root of 981526721 is about 993.8039283208.

The spelling of 981526721 in words is "nine hundred eighty-one million, five hundred twenty-six thousand, seven hundred twenty-one".