25252781 has 4 divisors (see below), whose sum is σ = 26350752. Its totient is φ = 24154812.

The previous prime is 25252757. The next prime is 25252811. The reversal of 25252781 is 18725252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25252781 - 2¹⁰ = 25251757 is a prime.

It is a super-2 number, since 2×25252781² = 1275405896467922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25252741) 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, 548951 + ... + 548996.

It is an arithmetic number, because the mean of its divisors is an integer number (6587688).

Almost surely, 2^25252781 is an apocalyptic number.

It is an amenable number.

25252781 is a deficient number, since it is larger than the sum of its proper divisors (1097971).

25252781 is a wasteful number, since it uses less digits than its factorization.

25252781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097970.

The product of its digits is 11200, while the sum is 32.

The square root of 25252781 is about 5025.2145227841. The cubic root of 25252781 is about 293.3839855998.

The spelling of 25252781 in words is "twenty-five million, two hundred fifty-two thousand, seven hundred eighty-one".