118737561 has 4 divisors (see below), whose sum is σ = 158316752. Its totient is φ = 79158372.

The previous prime is 118737547. The next prime is 118737583. The reversal of 118737561 is 165737811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 118737561 - 2⁶ = 118737497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (118737511) 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, 19789591 + ... + 19789596.

It is an arithmetic number, because the mean of its divisors is an integer number (39579188).

Almost surely, 2^118737561 is an apocalyptic number.

It is an amenable number.

118737561 is a deficient number, since it is larger than the sum of its proper divisors (39579191).

118737561 is an equidigital number, since it uses as much as digits as its factorization.

118737561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39579190.

The product of its digits is 35280, while the sum is 39.

The square root of 118737561 is about 10896.6766034420. The cubic root of 118737561 is about 491.5066233605.

The spelling of 118737561 in words is "one hundred eighteen million, seven hundred thirty-seven thousand, five hundred sixty-one".