79009181 has 2 divisors, whose sum is σ = 79009182. Its totient is φ = 79009180.

The previous prime is 79009159. The next prime is 79009193. The reversal of 79009181 is 18190097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78605956 + 403225 = 8866^2 + 635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79009181 is a prime.

It is a super-2 number, since 2×79009181² = 12484901364581522, which contains 22 as substring.

It is equal to p_4614938 and since 79009181 and 4614938 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79005181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39504590 + 39504591.

It is an arithmetic number, because the mean of its divisors is an integer number (39504591).

Almost surely, 2^79009181 is an apocalyptic number.

It is an amenable number.

79009181 is a deficient number, since it is larger than the sum of its proper divisors (1).

79009181 is an equidigital number, since it uses as much as digits as its factorization.

79009181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 79009181 is about 8888.7108739119. The cubic root of 79009181 is about 429.1006640866.

The spelling of 79009181 in words is "seventy-nine million, nine thousand, one hundred eighty-one".