79571386249 has 2 divisors, whose sum is σ = 79571386250. Its totient is φ = 79571386248.

The previous prime is 79571386229. The next prime is 79571386267. The reversal of 79571386249 is 94268317597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67681664649 + 11889721600 = 260157^2 + 109040^2 .

It is a cyclic number.

It is not a de Polignac number, because 79571386249 - 2²⁷ = 79437168521 is a prime.

It is not a weakly prime, because it can be changed into another prime (79571386229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39785693124 + 39785693125.

It is an arithmetic number, because the mean of its divisors is an integer number (39785693125).

Almost surely, 2^79571386249 is an apocalyptic number.

It is an amenable number.

79571386249 is a deficient number, since it is larger than the sum of its proper divisors (1).

79571386249 is an equidigital number, since it uses as much as digits as its factorization.

79571386249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 61.

The spelling of 79571386249 in words is "seventy-nine billion, five hundred seventy-one million, three hundred eighty-six thousand, two hundred forty-nine".