31264421 has 2 divisors, whose sum is σ = 31264422. Its totient is φ = 31264420.

The previous prime is 31264403. The next prime is 31264423. The reversal of 31264421 is 12446213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16900321 + 14364100 = 4111^2 + 3790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31264421 is a prime.

Together with 31264423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31264423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15632210 + 15632211.

It is an arithmetic number, because the mean of its divisors is an integer number (15632211).

Almost surely, 2^31264421 is an apocalyptic number.

It is an amenable number.

31264421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31264421 is an equidigital number, since it uses as much as digits as its factorization.

31264421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 31264421 is about 5591.4596484281. The cubic root of 31264421 is about 315.0287065465.

The spelling of 31264421 in words is "thirty-one million, two hundred sixty-four thousand, four hundred twenty-one".