118557431 has 2 divisors, whose sum is σ = 118557432. Its totient is φ = 118557430.

The previous prime is 118557403. The next prime is 118557443. The reversal of 118557431 is 134755811.

It is a strong prime.

It is an emirp because it is prime and its reverse (134755811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118557431 - 2⁶ = 118557367 is a prime.

It is a super-2 number, since 2×118557431² = 28111728890639522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 118557391 and 118557400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118557401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59278715 + 59278716.

It is an arithmetic number, because the mean of its divisors is an integer number (59278716).

Almost surely, 2^118557431 is an apocalyptic number.

118557431 is a deficient number, since it is larger than the sum of its proper divisors (1).

118557431 is an equidigital number, since it uses as much as digits as its factorization.

118557431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 35.

The square root of 118557431 is about 10888.4081021975. The cubic root of 118557431 is about 491.2579519892.

The spelling of 118557431 in words is "one hundred eighteen million, five hundred fifty-seven thousand, four hundred thirty-one".