25353721 has 2 divisors, whose sum is σ = 25353722. Its totient is φ = 25353720.

The previous prime is 25353709. The next prime is 25353791. The reversal of 25353721 is 12735352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21492496 + 3861225 = 4636^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 25353721 - 2⁵ = 25353689 is a prime.

It is a super-2 number, since 2×25353721² = 1285622337091682, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25353721.

It is not a weakly prime, because it can be changed into another prime (25353791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12676860 + 12676861.

It is an arithmetic number, because the mean of its divisors is an integer number (12676861).

Almost surely, 2^25353721 is an apocalyptic number.

It is an amenable number.

25353721 is a deficient number, since it is larger than the sum of its proper divisors (1).

25353721 is an equidigital number, since it uses as much as digits as its factorization.

25353721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 28.

The square root of 25353721 is about 5035.2478588447. The cubic root of 25353721 is about 293.7743691266.

The spelling of 25353721 in words is "twenty-five million, three hundred fifty-three thousand, seven hundred twenty-one".