79988749 has 2 divisors, whose sum is σ = 79988750. Its totient is φ = 79988748.

The previous prime is 79988747. The next prime is 79988767. The reversal of 79988749 is 94788997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67158025 + 12830724 = 8195^2 + 3582^2 .

It is an emirp because it is prime and its reverse (94788997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79988749 - 2¹ = 79988747 is a prime.

Together with 79988747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79988743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39994374 + 39994375.

It is an arithmetic number, because the mean of its divisors is an integer number (39994375).

Almost surely, 2^79988749 is an apocalyptic number.

It is an amenable number.

79988749 is a deficient number, since it is larger than the sum of its proper divisors (1).

79988749 is an equidigital number, since it uses as much as digits as its factorization.

79988749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 61.

The square root of 79988749 is about 8943.6429378637. The cubic root of 79988749 is about 430.8667374388.

The spelling of 79988749 in words is "seventy-nine million, nine hundred eighty-eight thousand, seven hundred forty-nine".