118242431 has 4 divisors (see below), whose sum is σ = 120246600. Its totient is φ = 116238264.

The previous prime is 118242419. The next prime is 118242457. The reversal of 118242431 is 134242811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134242811 = 307 ⋅437273.

It is a cyclic number.

It is not a de Polignac number, because 118242431 - 2¹⁸ = 117980287 is a prime.

It is a super-2 number, since 2×118242431² = 27962544977579522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 118242431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118242331) 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, 1001996 + ... + 1002113.

It is an arithmetic number, because the mean of its divisors is an integer number (30061650).

Almost surely, 2^118242431 is an apocalyptic number.

118242431 is a deficient number, since it is larger than the sum of its proper divisors (2004169).

118242431 is an equidigital number, since it uses as much as digits as its factorization.

118242431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004168.

The product of its digits is 1536, while the sum is 26.

The square root of 118242431 is about 10873.9335569057. The cubic root of 118242431 is about 490.8224850971.

The spelling of 118242431 in words is "one hundred eighteen million, two hundred forty-two thousand, four hundred thirty-one".