431973731977 has 2 divisors, whose sum is σ = 431973731978. Its totient is φ = 431973731976.

The previous prime is 431973731933. The next prime is 431973731983. The reversal of 431973731977 is 779137379134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399520069776 + 32453662201 = 632076^2 + 180149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431973731977 is a prime.

It is not a weakly prime, because it can be changed into another prime (431973732977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215986865988 + 215986865989.

It is an arithmetic number, because the mean of its divisors is an integer number (215986865989).

Almost surely, 2^431973731977 is an apocalyptic number.

It is an amenable number.

431973731977 is a deficient number, since it is larger than the sum of its proper divisors (1).

431973731977 is an equidigital number, since it uses as much as digits as its factorization.

431973731977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21003948, while the sum is 61.

The spelling of 431973731977 in words is "four hundred thirty-one billion, nine hundred seventy-three million, seven hundred thirty-one thousand, nine hundred seventy-seven".