25090661 has 4 divisors (see below), whose sum is σ = 25165452. Its totient is φ = 25015872.

The previous prime is 25090627. The next prime is 25090669. The reversal of 25090661 is 16609052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6002500 + 19088161 = 2450^2 + 4369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25090661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25090669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36890 + ... + 37563.

It is an arithmetic number, because the mean of its divisors is an integer number (6291363).

Almost surely, 2^25090661 is an apocalyptic number.

It is an amenable number.

25090661 is a deficient number, since it is larger than the sum of its proper divisors (74791).

25090661 is an equidigital number, since it uses as much as digits as its factorization.

25090661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74790.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 25090661 is about 5009.0578954530. The cubic root of 25090661 is about 292.7548065768.

The spelling of 25090661 in words is "twenty-five million, ninety thousand, six hundred sixty-one".