25320649 has 2 divisors, whose sum is σ = 25320650. Its totient is φ = 25320648.

The previous prime is 25320643. The next prime is 25320653. The reversal of 25320649 is 94602352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24255625 + 1065024 = 4925^2 + 1032^2 .

It is a cyclic number.

It is not a de Polignac number, because 25320649 - 2³ = 25320641 is a prime.

It is a super-2 number, since 2×25320649² = 1282270531562402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25320649.

It is not a weakly prime, because it can be changed into another prime (25320641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660324 + 12660325.

It is an arithmetic number, because the mean of its divisors is an integer number (12660325).

Almost surely, 2^25320649 is an apocalyptic number.

It is an amenable number.

25320649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25320649 is an equidigital number, since it uses as much as digits as its factorization.

25320649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 25320649 is about 5031.9627383358. The cubic root of 25320649 is about 293.6465781084.

It can be divided in two parts, 253 and 20649, that added together give a palindrome (20902).

The spelling of 25320649 in words is "twenty-five million, three hundred twenty thousand, six hundred forty-nine".