31213797 has 8 divisors (see below), whose sum is σ = 41660544. Its totient is φ = 20788128.

The previous prime is 31213753. The next prime is 31213799. The reversal of 31213797 is 79731213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31213797 - 2⁶ = 31213733 is a prime.

It is a super-2 number, since 2×31213797² = 1948602246314418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1408 + ... + 8025.

It is an arithmetic number, because the mean of its divisors is an integer number (5207568).

Almost surely, 2^31213797 is an apocalyptic number.

It is an amenable number.

31213797 is a deficient number, since it is larger than the sum of its proper divisors (10446747).

31213797 is a wasteful number, since it uses less digits than its factorization.

31213797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10539.

The product of its digits is 7938, while the sum is 33.

The square root of 31213797 is about 5586.9309106163. The cubic root of 31213797 is about 314.8585810144.

The spelling of 31213797 in words is "thirty-one million, two hundred thirteen thousand, seven hundred ninety-seven".