25249969 has 2 divisors, whose sum is σ = 25249970. Its totient is φ = 25249968.

The previous prime is 25249957. The next prime is 25249979. The reversal of 25249969 is 96994252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20584369 + 4665600 = 4537^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 25249969 - 2⁵ = 25249937 is a prime.

It is a super-2 number, since 2×25249969² = 1275121869001922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25249909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12624984 + 12624985.

It is an arithmetic number, because the mean of its divisors is an integer number (12624985).

Almost surely, 2^25249969 is an apocalyptic number.

It is an amenable number.

25249969 is a deficient number, since it is larger than the sum of its proper divisors (1).

25249969 is an equidigital number, since it uses as much as digits as its factorization.

25249969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 46.

The square root of 25249969 is about 5024.9347259442. The cubic root of 25249969 is about 293.3730953618.

The spelling of 25249969 in words is "twenty-five million, two hundred forty-nine thousand, nine hundred sixty-nine".