79555549 has 2 divisors, whose sum is σ = 79555550. Its totient is φ = 79555548.

The previous prime is 79555543. The next prime is 79555559. The reversal of 79555549 is 94555597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79334649 + 220900 = 8907^2 + 470^2 .

It is an emirp because it is prime and its reverse (94555597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79555549 - 2¹¹ = 79553501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79555543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39777774 + 39777775.

It is an arithmetic number, because the mean of its divisors is an integer number (39777775).

Almost surely, 2^79555549 is an apocalyptic number.

It is an amenable number.

79555549 is a deficient number, since it is larger than the sum of its proper divisors (1).

79555549 is an equidigital number, since it uses as much as digits as its factorization.

79555549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417500, while the sum is 49.

The square root of 79555549 is about 8919.3917393508. The cubic root of 79555549 is about 430.0875051769.

The spelling of 79555549 in words is "seventy-nine million, five hundred fifty-five thousand, five hundred forty-nine".