79169869 has 2 divisors, whose sum is σ = 79169870. Its totient is φ = 79169868.

The previous prime is 79169819. The next prime is 79169891. The reversal of 79169869 is 96896197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71402500 + 7767369 = 8450^2 + 2787^2 .

It is a cyclic number.

It is not a de Polignac number, because 79169869 - 2¹⁵ = 79137101 is a prime.

It is a super-2 number, since 2×79169869² = 12535736314954322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79169819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39584934 + 39584935.

It is an arithmetic number, because the mean of its divisors is an integer number (39584935).

Almost surely, 2^79169869 is an apocalyptic number.

It is an amenable number.

79169869 is a deficient number, since it is larger than the sum of its proper divisors (1).

79169869 is an equidigital number, since it uses as much as digits as its factorization.

79169869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 79169869 is about 8897.7451638041. The cubic root of 79169869 is about 429.3913671637.

The spelling of 79169869 in words is "seventy-nine million, one hundred sixty-nine thousand, eight hundred sixty-nine".