79997251 has 2 divisors, whose sum is σ = 79997252. Its totient is φ = 79997250.

The previous prime is 79997237. The next prime is 79997279. The reversal of 79997251 is 15279997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79997251 - 2⁹ = 79996739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79997195 and 79997204.

It is not a weakly prime, because it can be changed into another prime (79997221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39998625 + 39998626.

It is an arithmetic number, because the mean of its divisors is an integer number (39998626).

Almost surely, 2^79997251 is an apocalyptic number.

79997251 is a deficient number, since it is larger than the sum of its proper divisors (1).

79997251 is an equidigital number, since it uses as much as digits as its factorization.

79997251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 357210, while the sum is 49.

The square root of 79997251 is about 8944.1182349072. The cubic root of 79997251 is about 430.8820024990.

The spelling of 79997251 in words is "seventy-nine million, nine hundred ninety-seven thousand, two hundred fifty-one".