31055997 has 8 divisors (see below), whose sum is σ = 47323456. Its totient is φ = 17746272.

The previous prime is 31055989. The next prime is 31056029. The reversal of 31055997 is 79955013.

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

It is not a de Polignac number, because 31055997 - 2³ = 31055989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31055917) 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, 739408 + ... + 739449.

It is an arithmetic number, because the mean of its divisors is an integer number (5915432).

Almost surely, 2^31055997 is an apocalyptic number.

It is an amenable number.

31055997 is a deficient number, since it is larger than the sum of its proper divisors (16267459).

31055997 is a wasteful number, since it uses less digits than its factorization.

31055997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478867.

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 31055997 is about 5572.7907730328. The cubic root of 31055997 is about 314.3270997351.

The spelling of 31055997 in words is "thirty-one million, fifty-five thousand, nine hundred ninety-seven".