25963649 has 2 divisors, whose sum is σ = 25963650. Its totient is φ = 25963648.

The previous prime is 25963631. The next prime is 25963669. The reversal of 25963649 is 94636952.

25963649 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25959025 + 4624 = 5095^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 25963649 - 2²⁴ = 9186433 is a prime.

It is a super-2 number, since 2×25963649² = 1348222138790402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25963669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12981824 + 12981825.

It is an arithmetic number, because the mean of its divisors is an integer number (12981825).

Almost surely, 2^25963649 is an apocalyptic number.

It is an amenable number.

25963649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25963649 is an equidigital number, since it uses as much as digits as its factorization.

25963649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 25963649 is about 5095.4537580082. The cubic root of 25963649 is about 296.1114787367. Note that the first 3 decimals are identical.

The spelling of 25963649 in words is "twenty-five million, nine hundred sixty-three thousand, six hundred forty-nine".