25631493 has 4 divisors (see below), whose sum is σ = 34175328. Its totient is φ = 17087660.

The previous prime is 25631449. The next prime is 25631503. The reversal of 25631493 is 39413652.

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 25631493 - 2¹⁶ = 25565957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25631443) 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, 4271913 + ... + 4271918.

It is an arithmetic number, because the mean of its divisors is an integer number (8543832).

Almost surely, 2^25631493 is an apocalyptic number.

It is an amenable number.

25631493 is a deficient number, since it is larger than the sum of its proper divisors (8543835).

25631493 is an equidigital number, since it uses as much as digits as its factorization.

25631493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8543834.

The product of its digits is 19440, while the sum is 33.

The square root of 25631493 is about 5062.7554750353. The cubic root of 25631493 is about 294.8433257873.

The spelling of 25631493 in words is "twenty-five million, six hundred thirty-one thousand, four hundred ninety-three".