78118031 has 2 divisors, whose sum is σ = 78118032. Its totient is φ = 78118030.

The previous prime is 78117983. The next prime is 78118037. The reversal of 78118031 is 13081187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78118031 - 2²² = 73923727 is a prime.

It is a super-2 number, since 2×78118031² = 12204853534633922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78117985 and 78118003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78118037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39059015 + 39059016.

It is an arithmetic number, because the mean of its divisors is an integer number (39059016).

Almost surely, 2^78118031 is an apocalyptic number.

78118031 is a deficient number, since it is larger than the sum of its proper divisors (1).

78118031 is an equidigital number, since it uses as much as digits as its factorization.

78118031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 78118031 is about 8838.4405298672. The cubic root of 78118031 is about 427.4812750140.

The spelling of 78118031 in words is "seventy-eight million, one hundred eighteen thousand, thirty-one".