25821313 has 4 divisors (see below), whose sum is σ = 29510080. Its totient is φ = 22132548.

The previous prime is 25821307. The next prime is 25821329. The reversal of 25821313 is 31312852.

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 25821313 - 2¹³ = 25813121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25821413) 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, 1844373 + ... + 1844386.

It is an arithmetic number, because the mean of its divisors is an integer number (7377520).

Almost surely, 2^25821313 is an apocalyptic number.

It is an amenable number.

25821313 is a deficient number, since it is larger than the sum of its proper divisors (3688767).

25821313 is an equidigital number, since it uses as much as digits as its factorization.

25821313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688766.

The product of its digits is 1440, while the sum is 25.

The square root of 25821313 is about 5081.4676029667. The cubic root of 25821313 is about 295.5693800786.

The spelling of 25821313 in words is "twenty-five million, eight hundred twenty-one thousand, three hundred thirteen".