78117983 has 2 divisors, whose sum is σ = 78117984. Its totient is φ = 78117982.

The previous prime is 78117979. The next prime is 78118031. The reversal of 78117983 is 38971187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78117983 - 2² = 78117979 is a prime.

It is a super-2 number, since 2×78117983² = 12204838535976578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78117973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39058991 + 39058992.

It is an arithmetic number, because the mean of its divisors is an integer number (39058992).

Almost surely, 2^78117983 is an apocalyptic number.

78117983 is a deficient number, since it is larger than the sum of its proper divisors (1).

78117983 is an equidigital number, since it uses as much as digits as its factorization.

78117983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 44.

The square root of 78117983 is about 8838.4378144557. The cubic root of 78117983 is about 427.4811874580.

The spelling of 78117983 in words is "seventy-eight million, one hundred seventeen thousand, nine hundred eighty-three".