25223531 has 4 divisors (see below), whose sum is σ = 25578864. Its totient is φ = 24868200.

The previous prime is 25223509. The next prime is 25223551. The reversal of 25223531 is 13532252.

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

It is a cyclic number.

It is not a de Polignac number, because 25223531 - 2⁶ = 25223467 is a prime.

It is a super-2 number, since 2×25223531² = 1272453032215922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25223497 and 25223506.

It is not an unprimeable number, because it can be changed into a prime (25223501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177560 + ... + 177701.

It is an arithmetic number, because the mean of its divisors is an integer number (6394716).

Almost surely, 2^25223531 is an apocalyptic number.

25223531 is a deficient number, since it is larger than the sum of its proper divisors (355333).

25223531 is an equidigital number, since it uses as much as digits as its factorization.

25223531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355332.

The product of its digits is 1800, while the sum is 23.

The square root of 25223531 is about 5022.3033560310. The cubic root of 25223531 is about 293.2706674272.

Adding to 25223531 its reverse (13532252), we get a palindrome (38755783).

The spelling of 25223531 in words is "twenty-five million, two hundred twenty-three thousand, five hundred thirty-one".