25321631 has 4 divisors (see below), whose sum is σ = 25394952. Its totient is φ = 25248312.

The previous prime is 25321613. The next prime is 25321663. The reversal of 25321631 is 13612352.

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 25321631 - 2⁶ = 25321567 is a prime.

It is a super-2 number, since 2×25321631² = 1282369993000322, 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 = 25321597 and 25321606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25321601) 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, 36140 + ... + 36833.

It is an arithmetic number, because the mean of its divisors is an integer number (6348738).

Almost surely, 2^25321631 is an apocalyptic number.

25321631 is a deficient number, since it is larger than the sum of its proper divisors (73321).

25321631 is an equidigital number, since it uses as much as digits as its factorization.

25321631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73320.

The product of its digits is 1080, while the sum is 23.

The square root of 25321631 is about 5032.0603136290. The cubic root of 25321631 is about 293.6503741830.

Adding to 25321631 its reverse (13612352), we get a palindrome (38933983).

It can be divided in two parts, 25321 and 631, that added together give a palindrome (25952).

The spelling of 25321631 in words is "twenty-five million, three hundred twenty-one thousand, six hundred thirty-one".