25245781 has 4 divisors (see below), whose sum is σ = 27540864. Its totient is φ = 22950700.

The previous prime is 25245767. The next prime is 25245797. The reversal of 25245781 is 18754252.

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 25245781 - 2⁷ = 25245653 is a prime.

It is a super-2 number, since 2×25245781² = 1274698916599922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25245761) 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, 1147525 + ... + 1147546.

It is an arithmetic number, because the mean of its divisors is an integer number (6885216).

Almost surely, 2^25245781 is an apocalyptic number.

It is an amenable number.

25245781 is a deficient number, since it is larger than the sum of its proper divisors (2295083).

25245781 is a wasteful number, since it uses less digits than its factorization.

25245781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295082.

The product of its digits is 22400, while the sum is 34.

The square root of 25245781 is about 5024.5179868322. The cubic root of 25245781 is about 293.3568746889.

The spelling of 25245781 in words is "twenty-five million, two hundred forty-five thousand, seven hundred eighty-one".