79761391 has 2 divisors, whose sum is σ = 79761392. Its totient is φ = 79761390.

The previous prime is 79761377. The next prime is 79761403. The reversal of 79761391 is 19316797.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79761391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79761301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39880695 + 39880696.

It is an arithmetic number, because the mean of its divisors is an integer number (39880696).

Almost surely, 2^79761391 is an apocalyptic number.

79761391 is a deficient number, since it is larger than the sum of its proper divisors (1).

79761391 is an equidigital number, since it uses as much as digits as its factorization.

79761391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 43.

The square root of 79761391 is about 8930.9233005328. The cubic root of 79761391 is about 430.4581218034.

The spelling of 79761391 in words is "seventy-nine million, seven hundred sixty-one thousand, three hundred ninety-one".