38311420993 has 2 divisors, whose sum is σ = 38311420994. Its totient is φ = 38311420992.

The previous prime is 38311420981. The next prime is 38311421089. The reversal of 38311420993 is 39902411383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35865920689 + 2445500304 = 189383^2 + 49452^2 .

It is a cyclic number.

It is not a de Polignac number, because 38311420993 - 2²¹ = 38309323841 is a prime.

It is a super-2 number, since 2×38311420993² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38311420913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19155710496 + 19155710497.

It is an arithmetic number, because the mean of its divisors is an integer number (19155710497).

Almost surely, 2^38311420993 is an apocalyptic number.

It is an amenable number.

38311420993 is a deficient number, since it is larger than the sum of its proper divisors (1).

38311420993 is an equidigital number, since it uses as much as digits as its factorization.

38311420993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 38311420993 in words is "thirty-eight billion, three hundred eleven million, four hundred twenty thousand, nine hundred ninety-three".