7172279861 has 4 divisors (see below), whose sum is σ = 7203062412. Its totient is φ = 7141497312.

The previous prime is 7172279833. The next prime is 7172279893. The reversal of 7172279861 is 1689722717.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4048140625 + 3124139236 = 63625^2 + 55894^2 .

It is a cyclic number.

It is not a de Polignac number, because 7172279861 - 2¹⁰ = 7172278837 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 (7172279801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15390926 + ... + 15391391.

It is an arithmetic number, because the mean of its divisors is an integer number (1800765603).

Almost surely, 2^7172279861 is an apocalyptic number.

It is an amenable number.

7172279861 is a deficient number, since it is larger than the sum of its proper divisors (30782551).

7172279861 is a wasteful number, since it uses less digits than its factorization.

7172279861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30782550.

The product of its digits is 592704, while the sum is 50.

The square root of 7172279861 is about 84689.3137355593. The cubic root of 7172279861 is about 1928.4974802982.

The spelling of 7172279861 in words is "seven billion, one hundred seventy-two million, two hundred seventy-nine thousand, eight hundred sixty-one".