231747979 has 2 divisors, whose sum is σ = 231747980. Its totient is φ = 231747978.

The previous prime is 231747947. The next prime is 231747991. The reversal of 231747979 is 979747132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231747979 - 2⁵ = 231747947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231747679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115873989 + 115873990.

It is an arithmetic number, because the mean of its divisors is an integer number (115873990).

Almost surely, 2^231747979 is an apocalyptic number.

231747979 is a deficient number, since it is larger than the sum of its proper divisors (1).

231747979 is an equidigital number, since it uses as much as digits as its factorization.

231747979 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 231747979 is about 15223.2709691446. The cubic root of 231747979 is about 614.2407878679.

The spelling of 231747979 in words is "two hundred thirty-one million, seven hundred forty-seven thousand, nine hundred seventy-nine".