25350721 has 4 divisors (see below), whose sum is σ = 27655344. Its totient is φ = 23046100.

The previous prime is 25350713. The next prime is 25350733. The reversal of 25350721 is 12705352.

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 not a de Polignac number, because 25350721 - 2³ = 25350713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25351721) 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, 1152295 + ... + 1152316.

It is an arithmetic number, because the mean of its divisors is an integer number (6913836).

Almost surely, 2^25350721 is an apocalyptic number.

It is an amenable number.

25350721 is a deficient number, since it is larger than the sum of its proper divisors (2304623).

25350721 is a wasteful number, since it uses less digits than its factorization.

25350721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304622.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 25350721 is about 5034.9499500988. The cubic root of 25350721 is about 293.7627816379.

The spelling of 25350721 in words is "twenty-five million, three hundred fifty thousand, seven hundred twenty-one".