118778971 has 4 divisors (see below), whose sum is σ = 118934200. Its totient is φ = 118623744.

The previous prime is 118778963. The next prime is 118778987. The reversal of 118778971 is 179877811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179877811 = 89 ⋅2021099.

It is a cyclic number.

It is not a de Polignac number, because 118778971 - 2³ = 118778963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118778941) 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, 76461 + ... + 77998.

It is an arithmetic number, because the mean of its divisors is an integer number (29733550).

Almost surely, 2^118778971 is an apocalyptic number.

118778971 is a deficient number, since it is larger than the sum of its proper divisors (155229).

118778971 is an equidigital number, since it uses as much as digits as its factorization.

118778971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155228.

The product of its digits is 197568, while the sum is 49.

The square root of 118778971 is about 10898.5765584318. The cubic root of 118778971 is about 491.5637547447.

The spelling of 118778971 in words is "one hundred eighteen million, seven hundred seventy-eight thousand, nine hundred seventy-one".