79130981 has 2 divisors, whose sum is σ = 79130982. Its totient is φ = 79130980.

The previous prime is 79130959. The next prime is 79130993. The reversal of 79130981 is 18903197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71656225 + 7474756 = 8465^2 + 2734^2 .

It is an emirp because it is prime and its reverse (18903197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79130981 - 2⁶ = 79130917 is a prime.

It is a super-2 number, since 2×79130981² = 12523424308044722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79130911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39565490 + 39565491.

It is an arithmetic number, because the mean of its divisors is an integer number (39565491).

Almost surely, 2^79130981 is an apocalyptic number.

It is an amenable number.

79130981 is a deficient number, since it is larger than the sum of its proper divisors (1).

79130981 is an equidigital number, since it uses as much as digits as its factorization.

79130981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 79130981 is about 8895.5596226432. The cubic root of 79130981 is about 429.3210504027.

The spelling of 79130981 in words is "seventy-nine million, one hundred thirty thousand, nine hundred eighty-one".