79818157 has 2 divisors, whose sum is σ = 79818158. Its totient is φ = 79818156.

The previous prime is 79818131. The next prime is 79818161. The reversal of 79818157 is 75181897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78605956 + 1212201 = 8866^2 + 1101^2 .

It is a cyclic number.

It is not a de Polignac number, because 79818157 - 2¹¹ = 79816109 is a prime.

It is a super-3 number, since 3×79818157³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79818187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39909078 + 39909079.

It is an arithmetic number, because the mean of its divisors is an integer number (39909079).

Almost surely, 2^79818157 is an apocalyptic number.

It is an amenable number.

79818157 is a deficient number, since it is larger than the sum of its proper divisors (1).

79818157 is an equidigital number, since it uses as much as digits as its factorization.

79818157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 46.

The square root of 79818157 is about 8934.1007941482. The cubic root of 79818157 is about 430.5602162748.

The spelling of 79818157 in words is "seventy-nine million, eight hundred eighteen thousand, one hundred fifty-seven".