79491739 has 2 divisors, whose sum is σ = 79491740. Its totient is φ = 79491738.

The previous prime is 79491733. The next prime is 79491751. The reversal of 79491739 is 93719497.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93719497) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79491739 - 2⁹ = 79491227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79491692 and 79491701.

It is not a weakly prime, because it can be changed into another prime (79491733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39745869 + 39745870.

It is an arithmetic number, because the mean of its divisors is an integer number (39745870).

Almost surely, 2^79491739 is an apocalyptic number.

79491739 is a deficient number, since it is larger than the sum of its proper divisors (1).

79491739 is an equidigital number, since it uses as much as digits as its factorization.

79491739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 79491739 is about 8915.8139841520. The cubic root of 79491739 is about 429.9724860708.

The spelling of 79491739 in words is "seventy-nine million, four hundred ninety-one thousand, seven hundred thirty-nine".