25516961 has 2 divisors, whose sum is σ = 25516962. Its totient is φ = 25516960.

The previous prime is 25516957. The next prime is 25516979. The reversal of 25516961 is 16961552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25000000 + 516961 = 5000^2 + 719^2 .

It is a cyclic number.

It is not a de Polignac number, because 25516961 - 2² = 25516957 is a prime.

It is a super-2 number, since 2×25516961² = 1302230597351042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25516951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12758480 + 12758481.

It is an arithmetic number, because the mean of its divisors is an integer number (12758481).

Almost surely, 2^25516961 is an apocalyptic number.

It is an amenable number.

25516961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25516961 is an equidigital number, since it uses as much as digits as its factorization.

25516961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 25516961 is about 5051.4315792654. The cubic root of 25516961 is about 294.4035098296.

It can be divided in two parts, 25 and 516961, that multiplied together give a square (12924025 = 3595²).

The spelling of 25516961 in words is "twenty-five million, five hundred sixteen thousand, nine hundred sixty-one".