79980491 has 2 divisors, whose sum is σ = 79980492. Its totient is φ = 79980490.

The previous prime is 79980487. The next prime is 79980581. The reversal of 79980491 is 19408997.

It is a weak prime.

It is an emirp because it is prime and its reverse (19408997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79980491 - 2² = 79980487 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79980401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39990245 + 39990246.

It is an arithmetic number, because the mean of its divisors is an integer number (39990246).

Almost surely, 2^79980491 is an apocalyptic number.

79980491 is a deficient number, since it is larger than the sum of its proper divisors (1).

79980491 is an equidigital number, since it uses as much as digits as its factorization.

79980491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 79980491 is about 8943.1812572485. The cubic root of 79980491 is about 430.8519094369.

The spelling of 79980491 in words is "seventy-nine million, nine hundred eighty thousand, four hundred ninety-one".