31308797 has 8 divisors (see below), whose sum is σ = 34017144. Its totient is φ = 28643328.

The previous prime is 31308779. The next prime is 31308817. The reversal of 31308797 is 79780313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1943236 + 29365561 = 1394^2 + 5419^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31308797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31308797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31308997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9188 + ... + 12125.

It is an arithmetic number, because the mean of its divisors is an integer number (4252143).

Almost surely, 2^31308797 is an apocalyptic number.

It is an amenable number.

31308797 is a deficient number, since it is larger than the sum of its proper divisors (2708347).

31308797 is a wasteful number, since it uses less digits than its factorization.

31308797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21439.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 31308797 is about 5595.4264359386. The cubic root of 31308797 is about 315.1776842501.

The spelling of 31308797 in words is "thirty-one million, three hundred eight thousand, seven hundred ninety-seven".