25421951 has 4 divisors (see below), whose sum is σ = 26298600. Its totient is φ = 24545304.

The previous prime is 25421947. The next prime is 25421983. The reversal of 25421951 is 15912452.

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 25421951 - 2² = 25421947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 876619 = 25421951 / (2 + 5 + 4 + 2 + 1 + 9 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421251) 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, 438281 + ... + 438338.

It is an arithmetic number, because the mean of its divisors is an integer number (6574650).

Almost surely, 2^25421951 is an apocalyptic number.

25421951 is a deficient number, since it is larger than the sum of its proper divisors (876649).

25421951 is an equidigital number, since it uses as much as digits as its factorization.

25421951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876648.

The product of its digits is 3600, while the sum is 29.

The square root of 25421951 is about 5042.0185441944. The cubic root of 25421951 is about 294.0376608087.

The spelling of 25421951 in words is "twenty-five million, four hundred twenty-one thousand, nine hundred fifty-one".