78979951 has 2 divisors, whose sum is σ = 78979952. Its totient is φ = 78979950.

The previous prime is 78979921. The next prime is 78979961. The reversal of 78979951 is 15997987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78979951 - 2⁵ = 78979919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78979892 and 78979901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78979921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39489975 + 39489976.

It is an arithmetic number, because the mean of its divisors is an integer number (39489976).

Almost surely, 2^78979951 is an apocalyptic number.

78979951 is a deficient number, since it is larger than the sum of its proper divisors (1).

78979951 is an equidigital number, since it uses as much as digits as its factorization.

78979951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 55.

The square root of 78979951 is about 8887.0665013828. The cubic root of 78979951 is about 429.0477412941.

The spelling of 78979951 in words is "seventy-eight million, nine hundred seventy-nine thousand, nine hundred fifty-one".