25201561 has 16 divisors (see below), whose sum is σ = 31662720. Its totient is φ = 19486080.

The previous prime is 25201549. The next prime is 25201567. The reversal of 25201561 is 16510252.

It is a cyclic number.

It is not a de Polignac number, because 25201561 - 2¹⁷ = 25070489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25201567) 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, 9355 + ... + 11743.

It is an arithmetic number, because the mean of its divisors is an integer number (1978920).

Almost surely, 2^25201561 is an apocalyptic number.

It is an amenable number.

25201561 is a deficient number, since it is larger than the sum of its proper divisors (6461159).

25201561 is a wasteful number, since it uses less digits than its factorization.

25201561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 25201561 is about 5020.1156361184. The cubic root of 25201561 is about 293.1854952632.

The spelling of 25201561 in words is "twenty-five million, two hundred one thousand, five hundred sixty-one".