231550131947 has 2 divisors, whose sum is σ = 231550131948. Its totient is φ = 231550131946.

The previous prime is 231550131907. The next prime is 231550132111. The reversal of 231550131947 is 749131055132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231550131947 - 2²⁰ = 231549083371 is a prime.

It is a super-2 number, since 2×231550131947² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231550131907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115775065973 + 115775065974.

It is an arithmetic number, because the mean of its divisors is an integer number (115775065974).

Almost surely, 2^231550131947 is an apocalyptic number.

231550131947 is a deficient number, since it is larger than the sum of its proper divisors (1).

231550131947 is an equidigital number, since it uses as much as digits as its factorization.

231550131947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 231550131947 in words is "two hundred thirty-one billion, five hundred fifty million, one hundred thirty-one thousand, nine hundred forty-seven".