9172942861 has 4 divisors (see below), whose sum is σ = 9173166652. Its totient is φ = 9172719072.

The previous prime is 9172942853. The next prime is 9172942871. The reversal of 9172942861 is 1682492719.

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 9042868836 + 130074025 = 95094^2 + 11405^2 .

It is a cyclic number.

It is not a de Polignac number, because 9172942861 - 2³ = 9172942853 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 (9172942871) 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, 30840 + ... + 138913.

It is an arithmetic number, because the mean of its divisors is an integer number (2293291663).

Almost surely, 2^9172942861 is an apocalyptic number.

It is an amenable number.

9172942861 is a deficient number, since it is larger than the sum of its proper divisors (223791).

9172942861 is a wasteful number, since it uses less digits than its factorization.

9172942861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223790.

The product of its digits is 435456, while the sum is 49.

The square root of 9172942861 is about 95775.4815231957. The cubic root of 9172942861 is about 2093.3229239315.

The spelling of 9172942861 in words is "nine billion, one hundred seventy-two million, nine hundred forty-two thousand, eight hundred sixty-one".