231331433947 has 2 divisors, whose sum is σ = 231331433948. Its totient is φ = 231331433946.

The previous prime is 231331433939. The next prime is 231331434011. The reversal of 231331433947 is 749334133132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231331433947 - 2³ = 231331433939 is a prime.

It is not a weakly prime, because it can be changed into another prime (231331433917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115665716973 + 115665716974.

It is an arithmetic number, because the mean of its divisors is an integer number (115665716974).

Almost surely, 2^231331433947 is an apocalyptic number.

231331433947 is a deficient number, since it is larger than the sum of its proper divisors (1).

231331433947 is an equidigital number, since it uses as much as digits as its factorization.

231331433947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 43.

The spelling of 231331433947 in words is "two hundred thirty-one billion, three hundred thirty-one million, four hundred thirty-three thousand, nine hundred forty-seven".