118643431 has 2 divisors, whose sum is σ = 118643432. Its totient is φ = 118643430.

The previous prime is 118643411. The next prime is 118643443. The reversal of 118643431 is 134346811.

It is a strong prime.

It is an emirp because it is prime and its reverse (134346811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118643431 - 2⁷ = 118643303 is a prime.

It is a super-2 number, since 2×118643431² = 28152527438903522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 118643393 and 118643402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118643411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59321715 + 59321716.

It is an arithmetic number, because the mean of its divisors is an integer number (59321716).

Almost surely, 2^118643431 is an apocalyptic number.

118643431 is a deficient number, since it is larger than the sum of its proper divisors (1).

118643431 is an equidigital number, since it uses as much as digits as its factorization.

118643431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 118643431 is about 10892.3565402534. The cubic root of 118643431 is about 491.3767072968.

The spelling of 118643431 in words is "one hundred eighteen million, six hundred forty-three thousand, four hundred thirty-one".