39457581971 has 2 divisors, whose sum is σ = 39457581972. Its totient is φ = 39457581970.

The previous prime is 39457581959. The next prime is 39457581973. The reversal of 39457581971 is 17918575493.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39457581971 is a prime.

Together with 39457581973, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39457581971.

It is not a weakly prime, because it can be changed into another prime (39457581973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19728790985 + 19728790986.

It is an arithmetic number, because the mean of its divisors is an integer number (19728790986).

Almost surely, 2^39457581971 is an apocalyptic number.

39457581971 is a deficient number, since it is larger than the sum of its proper divisors (1).

39457581971 is an equidigital number, since it uses as much as digits as its factorization.

39457581971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9525600, while the sum is 59.

The spelling of 39457581971 in words is "thirty-nine billion, four hundred fifty-seven million, five hundred eighty-one thousand, nine hundred seventy-one".