25575989 has 2 divisors, whose sum is σ = 25575990. Its totient is φ = 25575988.

The previous prime is 25575967. The next prime is 25576003. The reversal of 25575989 is 98957552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23522500 + 2053489 = 4850^2 + 1433^2 .

It is a cyclic number.

It is not a de Polignac number, because 25575989 - 2¹⁶ = 25510453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25575929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12787994 + 12787995.

It is an arithmetic number, because the mean of its divisors is an integer number (12787995).

Almost surely, 2^25575989 is an apocalyptic number.

It is an amenable number.

25575989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25575989 is an equidigital number, since it uses as much as digits as its factorization.

25575989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 50.

The square root of 25575989 is about 5057.2709043515. The cubic root of 25575989 is about 294.6303480680.

The spelling of 25575989 in words is "twenty-five million, five hundred seventy-five thousand, nine hundred eighty-nine".