25173989 has 2 divisors, whose sum is σ = 25173990. Its totient is φ = 25173988.

The previous prime is 25173979. The next prime is 25174007. The reversal of 25173989 is 98937152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19651489 + 5522500 = 4433^2 + 2350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25173989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25173919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12586994 + 12586995.

It is an arithmetic number, because the mean of its divisors is an integer number (12586995).

Almost surely, 2^25173989 is an apocalyptic number.

It is an amenable number.

25173989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25173989 is an equidigital number, since it uses as much as digits as its factorization.

25173989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 25173989 is about 5017.3687327124. The cubic root of 25173989 is about 293.0785354828.

It can be divided in two parts, 25173 and 989, that added together give a palindrome (26162).

The spelling of 25173989 in words is "twenty-five million, one hundred seventy-three thousand, nine hundred eighty-nine".