36638831531 has 2 divisors, whose sum is σ = 36638831532. Its totient is φ = 36638831530.

The previous prime is 36638831503. The next prime is 36638831557. The reversal of 36638831531 is 13513883663.

It is a happy number.

36638831531 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 36638831531 - 2¹⁰ = 36638830507 is a prime.

It is a super-2 number, since 2×36638831531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (36638831231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18319415765 + 18319415766.

It is an arithmetic number, because the mean of its divisors is an integer number (18319415766).

Almost surely, 2^36638831531 is an apocalyptic number.

36638831531 is a deficient number, since it is larger than the sum of its proper divisors (1).

36638831531 is an equidigital number, since it uses as much as digits as its factorization.

36638831531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 47.

The spelling of 36638831531 in words is "thirty-six billion, six hundred thirty-eight million, eight hundred thirty-one thousand, five hundred thirty-one".