25478969 has 2 divisors, whose sum is σ = 25478970. Its totient is φ = 25478968.

The previous prime is 25478953. The next prime is 25479011. The reversal of 25478969 is 96987452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 1075369 = 4940^2 + 1037^2 .

It is a cyclic number.

It is not a de Polignac number, because 25478969 - 2⁴ = 25478953 is a prime.

It is a super-2 number, since 2×25478969² = 1298355722605922, which contains 22 as substring.

It is a Sophie Germain prime.

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

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25478909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12739484 + 12739485.

It is an arithmetic number, because the mean of its divisors is an integer number (12739485).

Almost surely, 2^25478969 is an apocalyptic number.

It is an amenable number.

25478969 is a deficient number, since it is larger than the sum of its proper divisors (1).

25478969 is an equidigital number, since it uses as much as digits as its factorization.

25478969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The square root of 25478969 is about 5047.6696603482. The cubic root of 25478969 is about 294.2573255744.

The spelling of 25478969 in words is "twenty-five million, four hundred seventy-eight thousand, nine hundred sixty-nine".