25538537 has 2 divisors, whose sum is σ = 25538538. Its totient is φ = 25538536.

The previous prime is 25538521. The next prime is 25538543. The reversal of 25538537 is 73583552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25361296 + 177241 = 5036^2 + 421^2 .

It is a cyclic number.

It is not a de Polignac number, because 25538537 - 2⁴ = 25538521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25538537.

It is not a weakly prime, because it can be changed into another prime (25538237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12769268 + 12769269.

It is an arithmetic number, because the mean of its divisors is an integer number (12769269).

Almost surely, 2^25538537 is an apocalyptic number.

It is an amenable number.

25538537 is a deficient number, since it is larger than the sum of its proper divisors (1).

25538537 is an equidigital number, since it uses as much as digits as its factorization.

25538537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 38.

The square root of 25538537 is about 5053.5667602200. The cubic root of 25538537 is about 294.4864645962.

The spelling of 25538537 in words is "twenty-five million, five hundred thirty-eight thousand, five hundred thirty-seven".