31869397 has 4 divisors (see below), whose sum is σ = 36422176. Its totient is φ = 27316620.

The previous prime is 31869379. The next prime is 31869401. The reversal of 31869397 is 79396813.

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 31869397 - 2⁷ = 31869269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31869367) 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, 2276379 + ... + 2276392.

It is an arithmetic number, because the mean of its divisors is an integer number (9105544).

Almost surely, 2^31869397 is an apocalyptic number.

It is an amenable number.

31869397 is a deficient number, since it is larger than the sum of its proper divisors (4552779).

31869397 is an equidigital number, since it uses as much as digits as its factorization.

31869397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4552778.

The product of its digits is 244944, while the sum is 46.

The square root of 31869397 is about 5645.2986634898. The cubic root of 31869397 is about 317.0477061686.

The spelling of 31869397 in words is "thirty-one million, eight hundred sixty-nine thousand, three hundred ninety-seven".