2118347431 has 2 divisors, whose sum is σ = 2118347432. Its totient is φ = 2118347430.

The previous prime is 2118347423. The next prime is 2118347447. The reversal of 2118347431 is 1347438112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2118347431 - 2³ = 2118347423 is a prime.

It is a super-2 number, since 2×2118347431² = 8974791676848599522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118347461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059173715 + 1059173716.

It is an arithmetic number, because the mean of its divisors is an integer number (1059173716).

Almost surely, 2^2118347431 is an apocalyptic number.

2118347431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118347431 is an equidigital number, since it uses as much as digits as its factorization.

2118347431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 2118347431 is about 46025.5084817104. The cubic root of 2118347431 is about 1284.2977749587.

The spelling of 2118347431 in words is "two billion, one hundred eighteen million, three hundred forty-seven thousand, four hundred thirty-one".