231797947 has 2 divisors, whose sum is σ = 231797948. Its totient is φ = 231797946.

The previous prime is 231797879. The next prime is 231797963. The reversal of 231797947 is 749797132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231797947 - 2²³ = 223409339 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231797947.

It is not a weakly prime, because it can be changed into another prime (231797347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115898973 + 115898974.

It is an arithmetic number, because the mean of its divisors is an integer number (115898974).

Almost surely, 2^231797947 is an apocalyptic number.

231797947 is a deficient number, since it is larger than the sum of its proper divisors (1).

231797947 is an equidigital number, since it uses as much as digits as its factorization.

231797947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 49.

The square root of 231797947 is about 15224.9120522911. The cubic root of 231797947 is about 614.2849309037.

The spelling of 231797947 in words is "two hundred thirty-one million, seven hundred ninety-seven thousand, nine hundred forty-seven".