79240561009 has 9 divisors (see below), whose sum is σ = 82842364633. Its totient is φ = 75789126292.

The previous prime is 79240560991. The next prime is 79240561019. The reversal of 79240561009 is 90016504297.

It is a happy number.

The square root of 79240561009 is 281497.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 79240561009 - 2⁷ = 79240560881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79240561019) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6468312 + ... + 6480550.

Almost surely, 2^79240561009 is an apocalyptic number.

79240561009 is the 281497-th square number.

79240561009 is the 140749-th centered octagonal number.

It is an amenable number.

79240561009 is a deficient number, since it is larger than the sum of its proper divisors (3601803624).

79240561009 is an frugal number, since it uses more digits than its factorization.

79240561009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24524 (or 12262 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 79240561009 in words is "seventy-nine billion, two hundred forty million, five hundred sixty-one thousand, nine".