25493561 has 2 divisors, whose sum is σ = 25493562. Its totient is φ = 25493560.

The previous prime is 25493551. The next prime is 25493569. The reversal of 25493561 is 16539452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24157225 + 1336336 = 4915^2 + 1156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25493561 is a prime.

It is equal to p_1594808 and since 25493561 and 1594808 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (25493569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12746780 + 12746781.

It is an arithmetic number, because the mean of its divisors is an integer number (12746781).

Almost surely, 2^25493561 is an apocalyptic number.

It is an amenable number.

25493561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25493561 is an equidigital number, since it uses as much as digits as its factorization.

25493561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 25493561 is about 5049.1148729257. The cubic root of 25493561 is about 294.3134893260.

The spelling of 25493561 in words is "twenty-five million, four hundred ninety-three thousand, five hundred sixty-one".