31973197 has 16 divisors (see below), whose sum is σ = 34312320. Its totient is φ = 29728512.

The previous prime is 31973191. The next prime is 31973203. The reversal of 31973197 is 79137913.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31973191) and next prime (31973203).

It is not a de Polignac number, because 31973197 - 2¹⁵ = 31940429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31973191) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229954 + ... + 230092.

It is an arithmetic number, because the mean of its divisors is an integer number (2144520).

Almost surely, 2^31973197 is an apocalyptic number.

It is an amenable number.

31973197 is a deficient number, since it is larger than the sum of its proper divisors (2339123).

31973197 is a wasteful number, since it uses less digits than its factorization.

31973197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372.

The product of its digits is 35721, while the sum is 40.

The square root of 31973197 is about 5654.4846803223. The cubic root of 31973197 is about 317.3915458207.

The spelling of 31973197 in words is "thirty-one million, nine hundred seventy-three thousand, one hundred ninety-seven".