79051639 has 2 divisors, whose sum is σ = 79051640. Its totient is φ = 79051638.

The previous prime is 79051631. The next prime is 79051699. The reversal of 79051639 is 93615097.

It is a weak prime.

It is an emirp because it is prime and its reverse (93615097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79051639 - 2³ = 79051631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79051631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39525819 + 39525820.

It is an arithmetic number, because the mean of its divisors is an integer number (39525820).

Almost surely, 2^79051639 is an apocalyptic number.

79051639 is a deficient number, since it is larger than the sum of its proper divisors (1).

79051639 is an equidigital number, since it uses as much as digits as its factorization.

79051639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 79051639 is about 8891.0988634701. The cubic root of 79051639 is about 429.1775137778.

The spelling of 79051639 in words is "seventy-nine million, fifty-one thousand, six hundred thirty-nine".