25693649 has 2 divisors, whose sum is σ = 25693650. Its totient is φ = 25693648.

The previous prime is 25693639. The next prime is 25693669. The reversal of 25693649 is 94639652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25684624 + 9025 = 5068^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 25693649 - 2¹² = 25689553 is a prime.

It is not a weakly prime, because it can be changed into another prime (25693639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12846824 + 12846825.

It is an arithmetic number, because the mean of its divisors is an integer number (12846825).

Almost surely, 2^25693649 is an apocalyptic number.

It is an amenable number.

25693649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25693649 is an equidigital number, since it uses as much as digits as its factorization.

25693649 is an evil number, because the sum of its binary digits is even.

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

The square root of 25693649 is about 5068.8903124846. The cubic root of 25693649 is about 295.0814636649.

The spelling of 25693649 in words is "twenty-five million, six hundred ninety-three thousand, six hundred forty-nine".