79744991 has 2 divisors, whose sum is σ = 79744992. Its totient is φ = 79744990.

The previous prime is 79744963. The next prime is 79745021. The reversal of 79744991 is 19944797.

It is a weak prime.

It is an emirp because it is prime and its reverse (19944797) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79744991 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79744921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39872495 + 39872496.

It is an arithmetic number, because the mean of its divisors is an integer number (39872496).

Almost surely, 2^79744991 is an apocalyptic number.

79744991 is a deficient number, since it is larger than the sum of its proper divisors (1).

79744991 is an equidigital number, since it uses as much as digits as its factorization.

79744991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The square root of 79744991 is about 8930.0050951833. The cubic root of 79744991 is about 430.4286171479.

The spelling of 79744991 in words is "seventy-nine million, seven hundred forty-four thousand, nine hundred ninety-one".