25271989 has 2 divisors, whose sum is σ = 25271990. Its totient is φ = 25271988.

The previous prime is 25271971. The next prime is 25271993. The reversal of 25271989 is 98917252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 917764 = 4935^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 25271989 - 2¹¹ = 25269941 is a prime.

It is a super-2 number, since 2×25271989² = 1277346856032242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25271189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12635994 + 12635995.

It is an arithmetic number, because the mean of its divisors is an integer number (12635995).

Almost surely, 2^25271989 is an apocalyptic number.

It is an amenable number.

25271989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25271989 is an equidigital number, since it uses as much as digits as its factorization.

25271989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 43.

The square root of 25271989 is about 5027.1253216923. The cubic root of 25271989 is about 293.4583522132.

The spelling of 25271989 in words is "twenty-five million, two hundred seventy-one thousand, nine hundred eighty-nine".