25505901 has 24 divisors (see below), whose sum is σ = 39084480. Its totient is φ = 16438680.

The previous prime is 25505849. The next prime is 25505903. The reversal of 25505901 is 10950552.

25505901 is a `hidden beast` number, since 25 + 50 + 590 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-25505901 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505903) 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 23 ways as a sum of consecutive naturals, for example, 25456 + ... + 26438.

It is an arithmetic number, because the mean of its divisors is an integer number (1628520).

Almost surely, 2^25505901 is an apocalyptic number.

It is an amenable number.

25505901 is a deficient number, since it is larger than the sum of its proper divisors (13578579).

25505901 is an equidigital number, since it uses as much as digits as its factorization.

25505901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 25505901 is about 5050.3367214474. The cubic root of 25505901 is about 294.3609685389.

The spelling of 25505901 in words is "twenty-five million, five hundred five thousand, nine hundred one".