2172358961 has 2 divisors, whose sum is σ = 2172358962. Its totient is φ = 2172358960.

The previous prime is 2172358931. The next prime is 2172358973. The reversal of 2172358961 is 1698532712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243267600 + 929091361 = 35260^2 + 30481^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172358961 - 2²² = 2168164657 is a prime.

It is not a weakly prime, because it can be changed into another prime (2172358931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086179480 + 1086179481.

It is an arithmetic number, because the mean of its divisors is an integer number (1086179481).

Almost surely, 2^2172358961 is an apocalyptic number.

It is an amenable number.

2172358961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172358961 is an equidigital number, since it uses as much as digits as its factorization.

2172358961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 2172358961 is about 46608.5717545603. The cubic root of 2172358961 is about 1295.1215502849.

The spelling of 2172358961 in words is "two billion, one hundred seventy-two million, three hundred fifty-eight thousand, nine hundred sixty-one".