25240661 has 4 divisors (see below), whose sum is σ = 25500972. Its totient is φ = 24980352.

The previous prime is 25240639. The next prime is 25240681. The reversal of 25240661 is 16604252.

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 13468900 + 11771761 = 3670^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 25240661 - 2¹⁸ = 24978517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 25240661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25240601) 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, 130010 + ... + 130203.

It is an arithmetic number, because the mean of its divisors is an integer number (6375243).

Almost surely, 2^25240661 is an apocalyptic number.

It is an amenable number.

25240661 is a deficient number, since it is larger than the sum of its proper divisors (260311).

25240661 is an equidigital number, since it uses as much as digits as its factorization.

25240661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260310.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25240661 is about 5024.0084593878. The cubic root of 25240661 is about 293.3370418207.

The spelling of 25240661 in words is "twenty-five million, two hundred forty thousand, six hundred sixty-one".