25781269 has 2 divisors, whose sum is σ = 25781270. Its totient is φ = 25781268.

The previous prime is 25781257. The next prime is 25781281. The reversal of 25781269 is 96218752.

It is a balanced prime because it is at equal distance from previous prime (25781257) and next prime (25781281).

It can be written as a sum of positive squares in only one way, i.e., 14976900 + 10804369 = 3870^2 + 3287^2 .

It is a cyclic number.

It is not a de Polignac number, because 25781269 - 2⁵ = 25781237 is a prime.

It is a super-2 number, since 2×25781269² = 1329347662500722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25781219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12890634 + 12890635.

It is an arithmetic number, because the mean of its divisors is an integer number (12890635).

Almost surely, 2^25781269 is an apocalyptic number.

It is an amenable number.

25781269 is a deficient number, since it is larger than the sum of its proper divisors (1).

25781269 is an equidigital number, since it uses as much as digits as its factorization.

25781269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 25781269 is about 5077.5258738878. The cubic root of 25781269 is about 295.4165101878.

The spelling of 25781269 in words is "twenty-five million, seven hundred eighty-one thousand, two hundred sixty-nine".