231144423997 has 2 divisors, whose sum is σ = 231144423998. Its totient is φ = 231144423996.

The previous prime is 231144423977. The next prime is 231144424081. The reversal of 231144423997 is 799324441132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209787816676 + 21356607321 = 458026^2 + 146139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231144423997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231144423997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231144423947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115572211998 + 115572211999.

It is an arithmetic number, because the mean of its divisors is an integer number (115572211999).

Almost surely, 2^231144423997 is an apocalyptic number.

It is an amenable number.

231144423997 is a deficient number, since it is larger than the sum of its proper divisors (1).

231144423997 is an equidigital number, since it uses as much as digits as its factorization.

231144423997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The spelling of 231144423997 in words is "two hundred thirty-one billion, one hundred forty-four million, four hundred twenty-three thousand, nine hundred ninety-seven".