25113561 has 16 divisors (see below), whose sum is σ = 36661248. Its totient is φ = 15165200.

The previous prime is 25113541. The next prime is 25113581. The reversal of 25113561 is 16531152.

It is an interprime number because it is at equal distance from previous prime (25113541) and next prime (25113581).

It is a cyclic number.

It is not a de Polignac number, because 25113561 - 2¹⁹ = 24589273 is a prime.

It is a super-2 number, since 2×25113561² = 1261381892201442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25113541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9040 + ... + 11486.

It is an arithmetic number, because the mean of its divisors is an integer number (2291328).

Almost surely, 2^25113561 is an apocalyptic number.

It is an amenable number.

25113561 is a deficient number, since it is larger than the sum of its proper divisors (11547687).

25113561 is a wasteful number, since it uses less digits than its factorization.

25113561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772.

The product of its digits is 900, while the sum is 24.

The square root of 25113561 is about 5011.3432331063. The cubic root of 25113561 is about 292.8438443070.

The spelling of 25113561 in words is "twenty-five million, one hundred thirteen thousand, five hundred sixty-one".