25098509 has 2 divisors, whose sum is σ = 25098510. Its totient is φ = 25098508.

The previous prime is 25098503. The next prime is 25098523. The reversal of 25098509 is 90589052.

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., 19386409 + 5712100 = 4403^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 25098509 - 2²⁴ = 8321293 is a prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25098503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12549254 + 12549255.

It is an arithmetic number, because the mean of its divisors is an integer number (12549255).

Almost surely, 2^25098509 is an apocalyptic number.

It is an amenable number.

25098509 is a deficient number, since it is larger than the sum of its proper divisors (1).

25098509 is an equidigital number, since it uses as much as digits as its factorization.

25098509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 25098509 is about 5009.8412150486. The cubic root of 25098509 is about 292.7853265674.

The spelling of 25098509 in words is "twenty-five million, ninety-eight thousand, five hundred nine".