25491553 has 2 divisors, whose sum is σ = 25491554. Its totient is φ = 25491552.

The previous prime is 25491539. The next prime is 25491563. The reversal of 25491553 is 35519452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18558864 + 6932689 = 4308^2 + 2633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25491553 is a prime.

It is not a weakly prime, because it can be changed into another prime (25491523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12745776 + 12745777.

It is an arithmetic number, because the mean of its divisors is an integer number (12745777).

Almost surely, 2^25491553 is an apocalyptic number.

It is an amenable number.

25491553 is a deficient number, since it is larger than the sum of its proper divisors (1).

25491553 is an equidigital number, since it uses as much as digits as its factorization.

25491553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 34.

The square root of 25491553 is about 5048.9160222765. The cubic root of 25491553 is about 294.3057619237.

The spelling of 25491553 in words is "twenty-five million, four hundred ninety-one thousand, five hundred fifty-three".