25911161 has 2 divisors, whose sum is σ = 25911162. Its totient is φ = 25911160.

The previous prime is 25911157. The next prime is 25911163. The reversal of 25911161 is 16111952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25441936 + 469225 = 5044^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 25911161 - 2² = 25911157 is a prime.

Together with 25911163, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25911161.

It is not a weakly prime, because it can be changed into another prime (25911163) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12955580 + 12955581.

It is an arithmetic number, because the mean of its divisors is an integer number (12955581).

Almost surely, 2^25911161 is an apocalyptic number.

It is an amenable number.

25911161 is a deficient number, since it is larger than the sum of its proper divisors (1).

25911161 is an equidigital number, since it uses as much as digits as its factorization.

25911161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 26.

The square root of 25911161 is about 5090.3006787419. The cubic root of 25911161 is about 295.9118048967.

The spelling of 25911161 in words is "twenty-five million, nine hundred eleven thousand, one hundred sixty-one".