31123197 has 64 divisors (see below), whose sum is σ = 56678400. Its totient is φ = 16691184.

The previous prime is 31123193. The next prime is 31123199. The reversal of 31123197 is 79132113.

It is not a de Polignac number, because 31123197 - 2² = 31123193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31123197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123193) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 290818 + ... + 290924.

It is an arithmetic number, because the mean of its divisors is an integer number (885600).

Almost surely, 2^31123197 is an apocalyptic number.

It is an amenable number.

31123197 is a deficient number, since it is larger than the sum of its proper divisors (25555203).

31123197 is an equidigital number, since it uses as much as digits as its factorization.

31123197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 136 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 31123197 is about 5578.8168100414. The cubic root of 31123197 is about 314.5536535522.

The spelling of 31123197 in words is "thirty-one million, one hundred twenty-three thousand, one hundred ninety-seven".