25121729 has 2 divisors, whose sum is σ = 25121730. Its totient is φ = 25121728.

The previous prime is 25121711. The next prime is 25121753. The reversal of 25121729 is 92712152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24275329 + 846400 = 4927^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 25121729 - 2²⁴ = 8344513 is a prime.

It is a super-2 number, since 2×25121729² = 1262202535898882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25123729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560864 + 12560865.

It is an arithmetic number, because the mean of its divisors is an integer number (12560865).

Almost surely, 2^25121729 is an apocalyptic number.

It is an amenable number.

25121729 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121729 is an equidigital number, since it uses as much as digits as its factorization.

25121729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 25121729 is about 5012.1581180166. The cubic root of 25121729 is about 292.8755892973.

The spelling of 25121729 in words is "twenty-five million, one hundred twenty-one thousand, seven hundred twenty-nine".