79621559 has 4 divisors (see below), whose sum is σ = 82367160. Its totient is φ = 76875960.

The previous prime is 79621537. The next prime is 79621573. The reversal of 79621559 is 95512697.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95512697 = 7 ⋅13644671.

It is a cyclic number.

It is not a de Polignac number, because 79621559 - 2¹² = 79617463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79621859) 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 in 3 ways as a sum of consecutive naturals, for example, 1372757 + ... + 1372814.

It is an arithmetic number, because the mean of its divisors is an integer number (20591790).

Almost surely, 2^79621559 is an apocalyptic number.

79621559 is a deficient number, since it is larger than the sum of its proper divisors (2745601).

79621559 is a wasteful number, since it uses less digits than its factorization.

79621559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2745600.

The product of its digits is 170100, while the sum is 44.

The square root of 79621559 is about 8923.0913365268. The cubic root of 79621559 is about 430.2064251354.

The spelling of 79621559 in words is "seventy-nine million, six hundred twenty-one thousand, five hundred fifty-nine".