38188917631 has 2 divisors, whose sum is σ = 38188917632. Its totient is φ = 38188917630.

The previous prime is 38188917581. The next prime is 38188917643. The reversal of 38188917631 is 13671988183.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38188917631 is a prime.

It is a super-2 number, since 2×38188917631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38188017631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19094458815 + 19094458816.

It is an arithmetic number, because the mean of its divisors is an integer number (19094458816).

Almost surely, 2^38188917631 is an apocalyptic number.

38188917631 is a deficient number, since it is larger than the sum of its proper divisors (1).

38188917631 is an equidigital number, since it uses as much as digits as its factorization.

38188917631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 55.

The spelling of 38188917631 in words is "thirty-eight billion, one hundred eighty-eight million, nine hundred seventeen thousand, six hundred thirty-one".