25496921 has 2 divisors, whose sum is σ = 25496922. Its totient is φ = 25496920.

The previous prime is 25496899. The next prime is 25496951. The reversal of 25496921 is 12969452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24641296 + 855625 = 4964^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 25496921 - 2¹⁴ = 25480537 is a prime.

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

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (25496951) 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, 12748460 + 12748461.

It is an arithmetic number, because the mean of its divisors is an integer number (12748461).

Almost surely, 2^25496921 is an apocalyptic number.

It is an amenable number.

25496921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25496921 is an equidigital number, since it uses as much as digits as its factorization.

25496921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 25496921 is about 5049.4475935492. The cubic root of 25496921 is about 294.3264187331.

The spelling of 25496921 in words is "twenty-five million, four hundred ninety-six thousand, nine hundred twenty-one".