25055721 has 12 divisors (see below), whose sum is σ = 36525060. Its totient is φ = 16549920.

The previous prime is 25055711. The next prime is 25055729. The reversal of 25055721 is 12755052.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14402025 + 10653696 = 3795^2 + 3264^2 .

It is not a de Polignac number, because 25055721 - 2⁷ = 25055593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25055729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11790 + ... + 13751.

It is an arithmetic number, because the mean of its divisors is an integer number (3043755).

Almost surely, 2^25055721 is an apocalyptic number.

It is an amenable number.

25055721 is a deficient number, since it is larger than the sum of its proper divisors (11469339).

25055721 is a wasteful number, since it uses less digits than its factorization.

25055721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25656 (or 25653 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 25055721 is about 5005.5689986254. The cubic root of 25055721 is about 292.6188515471.

The spelling of 25055721 in words is "twenty-five million, fifty-five thousand, seven hundred twenty-one".