25291921 has 4 divisors (see below), whose sum is σ = 25388352. Its totient is φ = 25195492.

The previous prime is 25291919. The next prime is 25291949. The reversal of 25291921 is 12919252.

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 25291921 - 2¹ = 25291919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25291951) 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, 47821 + ... + 48346.

It is an arithmetic number, because the mean of its divisors is an integer number (6347088).

Almost surely, 2^25291921 is an apocalyptic number.

It is an amenable number.

25291921 is a deficient number, since it is larger than the sum of its proper divisors (96431).

25291921 is an equidigital number, since it uses as much as digits as its factorization.

25291921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96430.

The product of its digits is 3240, while the sum is 31.

The square root of 25291921 is about 5029.1073760659. The cubic root of 25291921 is about 293.5354820715.

The spelling of 25291921 in words is "twenty-five million, two hundred ninety-one thousand, nine hundred twenty-one".