2173722961 has 2 divisors, whose sum is σ = 2173722962. Its totient is φ = 2173722960.

The previous prime is 2173722919. The next prime is 2173722979. The reversal of 2173722961 is 1692273712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2158159936 + 15563025 = 46456^2 + 3945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2173722961 is a prime.

It is a super-2 number, since 2×2173722961² = 9450143022357215042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2173792961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086861480 + 1086861481.

It is an arithmetic number, because the mean of its divisors is an integer number (1086861481).

Almost surely, 2^2173722961 is an apocalyptic number.

It is an amenable number.

2173722961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173722961 is an equidigital number, since it uses as much as digits as its factorization.

2173722961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 2173722961 is about 46623.2019599684. The cubic root of 2173722961 is about 1295.3925577049.

The spelling of 2173722961 in words is "two billion, one hundred seventy-three million, seven hundred twenty-two thousand, nine hundred sixty-one".