118290861 has 20 divisors (see below), whose sum is σ = 190300572. Its totient is φ = 72793728.

The previous prime is 118290857. The next prime is 118290871. The reversal of 118290861 is 168092811.

It can be written as a sum of positive squares in 2 ways, for example, as 59768361 + 58522500 = 7731^2 + 7650^2 .

It is not a de Polignac number, because 118290861 - 2² = 118290857 is a prime.

It is a super-2 number, since 2×118290861² = 27985455592242642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118290871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 55116 + ... + 57221.

Almost surely, 2^118290861 is an apocalyptic number.

It is an amenable number.

118290861 is a deficient number, since it is larger than the sum of its proper divisors (72009711).

118290861 is a wasteful number, since it uses less digits than its factorization.

118290861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112362 (or 112353 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 118290861 is about 10876.1602139726. The cubic root of 118290861 is about 490.8894866750.

The spelling of 118290861 in words is "one hundred eighteen million, two hundred ninety thousand, eight hundred sixty-one".