31308897 has 8 divisors (see below), whose sum is σ = 42317344. Its totient is φ = 20586528.

The previous prime is 31308887. The next prime is 31308913. The reversal of 31308897 is 79880313.

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

It is not a de Polignac number, because 31308897 - 2¹⁰ = 31307873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31308817) 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, 71263 + ... + 71700.

It is an arithmetic number, because the mean of its divisors is an integer number (5289668).

Almost surely, 2^31308897 is an apocalyptic number.

It is an amenable number.

31308897 is a deficient number, since it is larger than the sum of its proper divisors (11008447).

31308897 is a wasteful number, since it uses less digits than its factorization.

31308897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143039.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 31308897 is about 5595.4353718008. The cubic root of 31308897 is about 315.1780198079.

The spelling of 31308897 in words is "thirty-one million, three hundred eight thousand, eight hundred ninety-seven".