31197193 has 4 divisors (see below), whose sum is σ = 33032340. Its totient is φ = 29362048.

The previous prime is 31197167. The next prime is 31197203. The reversal of 31197193 is 39179113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39179113 = 211 ⋅185683.

It can be written as a sum of positive squares in 2 ways, for example, as 28334329 + 2862864 = 5323^2 + 1692^2 .

It is a cyclic number.

It is not a de Polignac number, because 31197193 - 2⁵ = 31197161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31197113) 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, 917548 + ... + 917581.

It is an arithmetic number, because the mean of its divisors is an integer number (8258085).

Almost surely, 2^31197193 is an apocalyptic number.

It is an amenable number.

31197193 is a deficient number, since it is larger than the sum of its proper divisors (1835147).

31197193 is a wasteful number, since it uses less digits than its factorization.

31197193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835146.

The product of its digits is 5103, while the sum is 34.

The square root of 31197193 is about 5585.4447450494. Note that the first 3 decimals coincide. The cubic root of 31197193 is about 314.8027420410.

The spelling of 31197193 in words is "thirty-one million, one hundred ninety-seven thousand, one hundred ninety-three".