25193989 has 2 divisors, whose sum is σ = 25193990. Its totient is φ = 25193988.

The previous prime is 25193977. The next prime is 25193999. The reversal of 25193989 is 98939152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 11168964 = 3745^2 + 3342^2 .

It is a cyclic number.

It is not a de Polignac number, because 25193989 - 2⁹ = 25193477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25193939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12596994 + 12596995.

It is an arithmetic number, because the mean of its divisors is an integer number (12596995).

Almost surely, 2^25193989 is an apocalyptic number.

It is an amenable number.

25193989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25193989 is an equidigital number, since it uses as much as digits as its factorization.

25193989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 46.

The square root of 25193989 is about 5019.3614135665. The cubic root of 25193989 is about 293.1561290539.

The spelling of 25193989 in words is "twenty-five million, one hundred ninety-three thousand, nine hundred eighty-nine".