25750921 has 6 divisors (see below), whose sum is σ = 29955210. Its totient is φ = 22072176.

The previous prime is 25750913. The next prime is 25750939. The reversal of 25750921 is 12905752.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 5175625 = 4536^2 + 2275^2 .

It is not a de Polignac number, because 25750921 - 2³ = 25750913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25750321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 262716 + ... + 262813.

It is an arithmetic number, because the mean of its divisors is an integer number (4992535).

Almost surely, 2^25750921 is an apocalyptic number.

It is an amenable number.

25750921 is a deficient number, since it is larger than the sum of its proper divisors (4204289).

25750921 is an equidigital number, since it uses as much as digits as its factorization.

25750921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525543 (or 525536 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 25750921 is about 5074.5365305612. The cubic root of 25750921 is about 295.3005497679.

The spelling of 25750921 in words is "twenty-five million, seven hundred fifty thousand, nine hundred twenty-one".