900981921 has 32 divisors (see below), whose sum is σ = 1434820608. Its totient is φ = 491705280.

The previous prime is 900981911. The next prime is 900982073. The reversal of 900981921 is 129189009.

It is a happy number.

It is not a de Polignac number, because 900981921 - 2¹⁰ = 900980897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 900981921.

It is not an unprimeable number, because it can be changed into a prime (900981911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480616 + ... + 482486.

It is an arithmetic number, because the mean of its divisors is an integer number (44838144).

Almost surely, 2^900981921 is an apocalyptic number.

It is an amenable number.

900981921 is a deficient number, since it is larger than the sum of its proper divisors (533838687).

900981921 is a wasteful number, since it uses less digits than its factorization.

900981921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 900981921 is about 30016.3608886887. The cubic root of 900981921 is about 965.8403808038.

The spelling of 900981921 in words is "nine hundred million, nine hundred eighty-one thousand, nine hundred twenty-one".