38405651491 has 2 divisors, whose sum is σ = 38405651492. Its totient is φ = 38405651490.

The previous prime is 38405651443. The next prime is 38405651527. The reversal of 38405651491 is 19415650483.

38405651491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38405651491 - 2⁷ = 38405651363 is a prime.

It is not a weakly prime, because it can be changed into another prime (38405651191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19202825745 + 19202825746.

It is an arithmetic number, because the mean of its divisors is an integer number (19202825746).

Almost surely, 2^38405651491 is an apocalyptic number.

38405651491 is a deficient number, since it is larger than the sum of its proper divisors (1).

38405651491 is an equidigital number, since it uses as much as digits as its factorization.

38405651491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 38405651491 in words is "thirty-eight billion, four hundred five million, six hundred fifty-one thousand, four hundred ninety-one".