25491554 has 12 divisors (see below), whose sum is σ = 42029862. Its totient is φ = 11586960.

The previous prime is 25491553. The next prime is 25491563. The reversal of 25491554 is 45519452.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14235529 + 11256025 = 3773^2 + 3355^2 .

It is not an unprimeable number, because it can be changed into a prime (25491553) 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 in 5 ways as a sum of consecutive naturals, for example, 52427 + ... + 52910.

Almost surely, 2^25491554 is an apocalyptic number.

25491554 is a deficient number, since it is larger than the sum of its proper divisors (16538308).

25491554 is a wasteful number, since it uses less digits than its factorization.

25491554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105361 (or 105350 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 25491554 is about 5048.9161213076. The cubic root of 25491554 is about 294.3057657722.

The spelling of 25491554 in words is "twenty-five million, four hundred ninety-one thousand, five hundred fifty-four".