78101113 has 2 divisors, whose sum is σ = 78101114. Its totient is φ = 78101112.

The previous prime is 78101099. The next prime is 78101131. The reversal of 78101113 is 31110187.

Together with next prime (78101131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71690089 + 6411024 = 8467^2 + 2532^2 .

It is a cyclic number.

It is not a de Polignac number, because 78101113 - 2⁵ = 78101081 is a prime.

It is not a weakly prime, because it can be changed into another prime (78101143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39050556 + 39050557.

It is an arithmetic number, because the mean of its divisors is an integer number (39050557).

Almost surely, 2^78101113 is an apocalyptic number.

It is an amenable number.

78101113 is a deficient number, since it is larger than the sum of its proper divisors (1).

78101113 is an equidigital number, since it uses as much as digits as its factorization.

78101113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 78101113 is about 8837.4834087539. The cubic root of 78101113 is about 427.4504129528.

The spelling of 78101113 in words is "seventy-eight million, one hundred one thousand, one hundred thirteen".