79975549 has 2 divisors, whose sum is σ = 79975550. Its totient is φ = 79975548.

The previous prime is 79975547. The next prime is 79975561. The reversal of 79975549 is 94557997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40411449 + 39564100 = 6357^2 + 6290^2 .

It is an emirp because it is prime and its reverse (94557997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79975549 - 2¹ = 79975547 is a prime.

Together with 79975547, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79975549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79975547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39987774 + 39987775.

It is an arithmetic number, because the mean of its divisors is an integer number (39987775).

Almost surely, 2^79975549 is an apocalyptic number.

It is an amenable number.

79975549 is a deficient number, since it is larger than the sum of its proper divisors (1).

79975549 is an equidigital number, since it uses as much as digits as its factorization.

79975549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3572100, while the sum is 55.

The square root of 79975549 is about 8942.9049530899. The cubic root of 79975549 is about 430.8430351311.

The spelling of 79975549 in words is "seventy-nine million, nine hundred seventy-five thousand, five hundred forty-nine".