25190921 has 4 divisors (see below), whose sum is σ = 28789632. Its totient is φ = 21592212.

The previous prime is 25190917. The next prime is 25190947. The reversal of 25190921 is 12909152.

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 25190921 - 2² = 25190917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25190951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1799345 + ... + 1799358.

It is an arithmetic number, because the mean of its divisors is an integer number (7197408).

Almost surely, 2^25190921 is an apocalyptic number.

It is an amenable number.

25190921 is a deficient number, since it is larger than the sum of its proper divisors (3598711).

25190921 is an equidigital number, since it uses as much as digits as its factorization.

25190921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598710.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 25190921 is about 5019.0557876955. The cubic root of 25190921 is about 293.1442288672.

The spelling of 25190921 in words is "twenty-five million, one hundred ninety thousand, nine hundred twenty-one".