78353117 has 2 divisors, whose sum is σ = 78353118. Its totient is φ = 78353116.

The previous prime is 78353071. The next prime is 78353129. The reversal of 78353117 is 71135387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72148036 + 6205081 = 8494^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 78353117 - 2⁶ = 78353053 is a prime.

It is a super-2 number, since 2×78353117² = 12278421887231378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78353147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39176558 + 39176559.

It is an arithmetic number, because the mean of its divisors is an integer number (39176559).

Almost surely, 2^78353117 is an apocalyptic number.

It is an amenable number.

78353117 is a deficient number, since it is larger than the sum of its proper divisors (1).

78353117 is an equidigital number, since it uses as much as digits as its factorization.

78353117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 35.

The square root of 78353117 is about 8851.7296049981. The cubic root of 78353117 is about 427.9096619102.

The spelling of 78353117 in words is "seventy-eight million, three hundred fifty-three thousand, one hundred seventeen".