11318865631 has 4 divisors (see below), whose sum is σ = 11487803992. Its totient is φ = 11149927272.

The previous prime is 11318865601. The next prime is 11318865661. The reversal of 11318865631 is 13656881311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13656881311 = 71 ⋅192350441.

It is an interprime number because it is at equal distance from previous prime (11318865601) and next prime (11318865661).

It is a cyclic number.

It is not a de Polignac number, because 11318865631 - 2¹³ = 11318857439 is a prime.

It is a super-2 number, since 2×11318865631² (a number of 21 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 (11318865601) 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, 84469080 + ... + 84469213.

It is an arithmetic number, because the mean of its divisors is an integer number (2871950998).

Almost surely, 2^11318865631 is an apocalyptic number.

11318865631 is a deficient number, since it is larger than the sum of its proper divisors (168938361).

11318865631 is an equidigital number, since it uses as much as digits as its factorization.

11318865631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168938360.

The product of its digits is 103680, while the sum is 43.

The spelling of 11318865631 in words is "eleven billion, three hundred eighteen million, eight hundred sixty-five thousand, six hundred thirty-one".