31797197 has 4 divisors (see below), whose sum is σ = 31809756. Its totient is φ = 31784640.

The previous prime is 31797193. The next prime is 31797221. The reversal of 31797197 is 79179713.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 31147561 + 649636 = 5581^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 31797197 - 2² = 31797193 is a prime.

It is a super-2 number, since 2×31797197² = 2022123474113618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31797193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1004 + ... + 8037.

It is an arithmetic number, because the mean of its divisors is an integer number (7952439).

Almost surely, 2^31797197 is an apocalyptic number.

It is an amenable number.

31797197 is a deficient number, since it is larger than the sum of its proper divisors (12559).

31797197 is an equidigital number, since it uses as much as digits as its factorization.

31797197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12558.

The product of its digits is 83349, while the sum is 44.

The square root of 31797197 is about 5638.9003360584. The cubic root of 31797197 is about 316.8081016712.

The spelling of 31797197 in words is "thirty-one million, seven hundred ninety-seven thousand, one hundred ninety-seven".