118781857 has 2 divisors, whose sum is σ = 118781858. Its totient is φ = 118781856.

The previous prime is 118781837. The next prime is 118781893. The reversal of 118781857 is 758187811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90649441 + 28132416 = 9521^2 + 5304^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118781857 is a prime.

It is not a weakly prime, because it can be changed into another prime (118781837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59390928 + 59390929.

It is an arithmetic number, because the mean of its divisors is an integer number (59390929).

Almost surely, 2^118781857 is an apocalyptic number.

It is an amenable number.

118781857 is a deficient number, since it is larger than the sum of its proper divisors (1).

118781857 is an equidigital number, since it uses as much as digits as its factorization.

118781857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 46.

The square root of 118781857 is about 10898.7089602393. The cubic root of 118781857 is about 491.5677359250.

The spelling of 118781857 in words is "one hundred eighteen million, seven hundred eighty-one thousand, eight hundred fifty-seven".