1138640212631 has 4 divisors (see below), whose sum is σ = 1138644937632. Its totient is φ = 1138635487632.

The previous prime is 1138640212597. The next prime is 1138640212673. The reversal of 1138640212631 is 1362120468311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138640212631 is a prime.

It is a super-2 number, since 2×1138640212631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138640212691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980431 + ... + 2489856.

It is an arithmetic number, because the mean of its divisors is an integer number (284661234408).

Almost surely, 2^{1138640212631} is an apocalyptic number.

1138640212631 is a deficient number, since it is larger than the sum of its proper divisors (4725001).

1138640212631 is an equidigital number, since it uses as much as digits as its factorization.

1138640212631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4725000.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 1138640212631 in words is "one trillion, one hundred thirty-eight billion, six hundred forty million, two hundred twelve thousand, six hundred thirty-one".