25308561 has 16 divisors (see below), whose sum is σ = 35280000. Its totient is φ = 16117248.

The previous prime is 25308527. The next prime is 25308571. The reversal of 25308561 is 16580352.

It is not a de Polignac number, because 25308561 - 2¹⁵ = 25275793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25308571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6940 + ... + 9938.

It is an arithmetic number, because the mean of its divisors is an integer number (2205000).

Almost surely, 2^25308561 is an apocalyptic number.

It is an amenable number.

25308561 is a deficient number, since it is larger than the sum of its proper divisors (9971439).

25308561 is a wasteful number, since it uses less digits than its factorization.

25308561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 25308561 is about 5030.7614731768. The cubic root of 25308561 is about 293.5998420125.

The spelling of 25308561 in words is "twenty-five million, three hundred eight thousand, five hundred sixty-one".