71937257891 has 2 divisors, whose sum is σ = 71937257892. Its totient is φ = 71937257890.

The previous prime is 71937257857. The next prime is 71937257923. The reversal of 71937257891 is 19875273917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71937257891 - 2¹⁴ = 71937241507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71937257891.

It is not a weakly prime, because it can be changed into another prime (71937257191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35968628945 + 35968628946.

It is an arithmetic number, because the mean of its divisors is an integer number (35968628946).

Almost surely, 2^71937257891 is an apocalyptic number.

71937257891 is a deficient number, since it is larger than the sum of its proper divisors (1).

71937257891 is an equidigital number, since it uses as much as digits as its factorization.

71937257891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 59.

The spelling of 71937257891 in words is "seventy-one billion, nine hundred thirty-seven million, two hundred fifty-seven thousand, eight hundred ninety-one".