25422781 has 4 divisors (see below), whose sum is σ = 25516864. Its totient is φ = 25328700.

The previous prime is 25422743. The next prime is 25422791. The reversal of 25422781 is 18722452.

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 25422781 - 2¹⁷ = 25291709 is a prime.

It is a super-2 number, since 2×25422781² = 1292635587547922, 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 (25422791) 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, 46635 + ... + 47176.

It is an arithmetic number, because the mean of its divisors is an integer number (6379216).

Almost surely, 2^25422781 is an apocalyptic number.

It is an amenable number.

25422781 is a deficient number, since it is larger than the sum of its proper divisors (94083).

25422781 is an equidigital number, since it uses as much as digits as its factorization.

25422781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94082.

The product of its digits is 8960, while the sum is 31.

The square root of 25422781 is about 5042.1008518275. The cubic root of 25422781 is about 294.0408607808.

The spelling of 25422781 in words is "twenty-five million, four hundred twenty-two thousand, seven hundred eighty-one".