2154628961 has 2 divisors, whose sum is σ = 2154628962. Its totient is φ = 2154628960.

The previous prime is 2154628913. The next prime is 2154628963. The reversal of 2154628961 is 1698264512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1829187361 + 325441600 = 42769^2 + 18040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154628961 - 2⁶ = 2154628897 is a prime.

Together with 2154628963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2154628963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077314480 + 1077314481.

It is an arithmetic number, because the mean of its divisors is an integer number (1077314481).

Almost surely, 2^2154628961 is an apocalyptic number.

It is an amenable number.

2154628961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154628961 is an equidigital number, since it uses as much as digits as its factorization.

2154628961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 2154628961 is about 46417.9810095183. The cubic root of 2154628961 is about 1291.5884846433.

The spelling of 2154628961 in words is "two billion, one hundred fifty-four million, six hundred twenty-eight thousand, nine hundred sixty-one".