931738921 has 16 divisors (see below), whose sum is σ = 983243008. Its totient is φ = 881798400.

The previous prime is 931738919. The next prime is 931738933. The reversal of 931738921 is 129837139.

931738921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a 9-Lehmer number, since φ(931738921) divides (931738921-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 931738921 - 2¹ = 931738919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a deceptive number, since it divides R_931738920.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (931738991) 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, 430081 + ... + 432241.

It is an arithmetic number, because the mean of its divisors is an integer number (61452688).

Almost surely, 2^931738921 is an apocalyptic number.

It is an amenable number.

931738921 is a deficient number, since it is larger than the sum of its proper divisors (51504087).

931738921 is a wasteful number, since it uses less digits than its factorization.

931738921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512.

The product of its digits is 81648, while the sum is 43.

The square root of 931738921 is about 30524.3987819580. The cubic root of 931738921 is about 976.7080019288.

The spelling of 931738921 in words is "nine hundred thirty-one million, seven hundred thirty-eight thousand, nine hundred twenty-one".