118138897 has 2 divisors, whose sum is σ = 118138898. Its totient is φ = 118138896.

The previous prime is 118138859. The next prime is 118138907. The reversal of 118138897 is 798831811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104530176 + 13608721 = 10224^2 + 3689^2 .

It is an emirp because it is prime and its reverse (798831811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118138897 is a prime.

It is not a weakly prime, because it can be changed into another prime (118138297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59069448 + 59069449.

It is an arithmetic number, because the mean of its divisors is an integer number (59069449).

Almost surely, 2^118138897 is an apocalyptic number.

It is an amenable number.

118138897 is a deficient number, since it is larger than the sum of its proper divisors (1).

118138897 is an equidigital number, since it uses as much as digits as its factorization.

118138897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 46.

The square root of 118138897 is about 10869.1718635782. The cubic root of 118138897 is about 490.6791872589.

The spelling of 118138897 in words is "one hundred eighteen million, one hundred thirty-eight thousand, eight hundred ninety-seven".