57431181336491 has 2 divisors, whose sum is σ = 57431181336492. Its totient is φ = 57431181336490.

The previous prime is 57431181336457. The next prime is 57431181336547. The reversal of 57431181336491 is 19463318113475.

It is an a-pointer prime, because the next prime (57431181336547) can be obtained adding 57431181336491 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57431181336491 - 2²² = 57431177142187 is a prime.

It is not a weakly prime, because it can be changed into another prime (57431181336091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28715590668245 + 28715590668246.

It is an arithmetic number, because the mean of its divisors is an integer number (28715590668246).

Almost surely, 2^{57431181336491} is an apocalyptic number.

57431181336491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57431181336491 is an equidigital number, since it uses as much as digits as its factorization.

57431181336491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 56.

The spelling of 57431181336491 in words is "fifty-seven trillion, four hundred thirty-one billion, one hundred eighty-one million, three hundred thirty-six thousand, four hundred ninety-one".