31264289 has 4 divisors (see below), whose sum is σ = 35730624. Its totient is φ = 26797956.

The previous prime is 31264283. The next prime is 31264313. The reversal of 31264289 is 98246213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31264289 - 2⁸ = 31264033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31264283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2233157 + ... + 2233170.

It is an arithmetic number, because the mean of its divisors is an integer number (8932656).

Almost surely, 2^31264289 is an apocalyptic number.

It is an amenable number.

31264289 is a deficient number, since it is larger than the sum of its proper divisors (4466335).

31264289 is an equidigital number, since it uses as much as digits as its factorization.

31264289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466334.

The product of its digits is 20736, while the sum is 35.

The square root of 31264289 is about 5591.4478447000. The cubic root of 31264289 is about 315.0282631901.

The spelling of 31264289 in words is "thirty-one million, two hundred sixty-four thousand, two hundred eighty-nine".