1138916931 has 4 divisors (see below), whose sum is σ = 1518555912. Its totient is φ = 759277952.

The previous prime is 1138916917. The next prime is 1138916951. The reversal of 1138916931 is 1396198311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1396198311 = 3 ⋅465399437.

It is a cyclic number.

It is not a de Polignac number, because 1138916931 - 2⁹ = 1138916419 is a prime.

It is a super-2 number, since 2×1138916931² = 2594263551436917522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1138916951) 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, 189819486 + ... + 189819491.

It is an arithmetic number, because the mean of its divisors is an integer number (379638978).

Almost surely, 2^1138916931 is an apocalyptic number.

1138916931 is a deficient number, since it is larger than the sum of its proper divisors (379638981).

1138916931 is an equidigital number, since it uses as much as digits as its factorization.

1138916931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379638980.

The product of its digits is 34992, while the sum is 42.

The square root of 1138916931 is about 33747.8433533167. The cubic root of 1138916931 is about 1044.3129970128.

The spelling of 1138916931 in words is "one billion, one hundred thirty-eight million, nine hundred sixteen thousand, nine hundred thirty-one".