25530257 has 2 divisors, whose sum is σ = 25530258. Its totient is φ = 25530256.

The previous prime is 25530247. The next prime is 25530287. The reversal of 25530257 is 75203552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19571776 + 5958481 = 4424^2 + 2441^2 .

It is a cyclic number.

It is not a de Polignac number, because 25530257 - 2¹⁰ = 25529233 is a prime.

It is not a weakly prime, because it can be changed into another prime (25530247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765128 + 12765129.

It is an arithmetic number, because the mean of its divisors is an integer number (12765129).

Almost surely, 2^25530257 is an apocalyptic number.

It is an amenable number.

25530257 is a deficient number, since it is larger than the sum of its proper divisors (1).

25530257 is an equidigital number, since it uses as much as digits as its factorization.

25530257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 29.

The square root of 25530257 is about 5052.7474704363. The cubic root of 25530257 is about 294.4546354238.

The spelling of 25530257 in words is "twenty-five million, five hundred thirty thousand, two hundred fifty-seven".