438658317991 has 2 divisors, whose sum is σ = 438658317992. Its totient is φ = 438658317990.

The previous prime is 438658317983. The next prime is 438658318003. The reversal of 438658317991 is 199713856834.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 438658317991 - 2³ = 438658317983 is a prime.

It is a super-2 number, since 2×438658317991² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438658317931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219329158995 + 219329158996.

It is an arithmetic number, because the mean of its divisors is an integer number (219329158996).

Almost surely, 2^438658317991 is an apocalyptic number.

438658317991 is a deficient number, since it is larger than the sum of its proper divisors (1).

438658317991 is an equidigital number, since it uses as much as digits as its factorization.

438658317991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39191040, while the sum is 64.

The spelling of 438658317991 in words is "four hundred thirty-eight billion, six hundred fifty-eight million, three hundred seventeen thousand, nine hundred ninety-one".