31326921 has 6 divisors (see below), whose sum is σ = 45250010. Its totient is φ = 20884608.

The previous prime is 31326917. The next prime is 31326923. The reversal of 31326921 is 12962313.

It can be written as a sum of positive squares in only one way, i.e., 31236921 + 90000 = 5589^2 + 300^2 .

It is not a de Polignac number, because 31326921 - 2² = 31326917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31326923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1740376 + ... + 1740393.

Almost surely, 2^31326921 is an apocalyptic number.

It is an amenable number.

31326921 is a deficient number, since it is larger than the sum of its proper divisors (13923089).

31326921 is a wasteful number, since it uses less digits than its factorization.

31326921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480775 (or 3480772 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 31326921 is about 5597.0457386017. The cubic root of 31326921 is about 315.2384890825.

The spelling of 31326921 in words is "thirty-one million, three hundred twenty-six thousand, nine hundred twenty-one".