25456709 has 2 divisors, whose sum is σ = 25456710. Its totient is φ = 25456708.

The previous prime is 25456687. The next prime is 25456721. The reversal of 25456709 is 90765452.

25456709 = 2912² + 2913² + 2914².

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 3319684 = 4705^2 + 1822^2 .

It is a cyclic number.

It is not a de Polignac number, because 25456709 - 2¹⁶ = 25391173 is a prime.

It is a super-2 number, since 2×25456709² = 1296088066221362, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25456729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12728354 + 12728355.

It is an arithmetic number, because the mean of its divisors is an integer number (12728355).

Almost surely, 2^25456709 is an apocalyptic number.

It is an amenable number.

25456709 is a deficient number, since it is larger than the sum of its proper divisors (1).

25456709 is an equidigital number, since it uses as much as digits as its factorization.

25456709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 25456709 is about 5045.4642006460. The cubic root of 25456709 is about 294.1716068190.

The spelling of 25456709 in words is "twenty-five million, four hundred fifty-six thousand, seven hundred nine".