25535197 has 2 divisors, whose sum is σ = 25535198. Its totient is φ = 25535196.

The previous prime is 25535189. The next prime is 25535201. The reversal of 25535197 is 79153552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 7650756 = 4229^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 25535197 - 2³ = 25535189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25535177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12767598 + 12767599.

It is an arithmetic number, because the mean of its divisors is an integer number (12767599).

Almost surely, 2^25535197 is an apocalyptic number.

It is an amenable number.

25535197 is a deficient number, since it is larger than the sum of its proper divisors (1).

25535197 is an equidigital number, since it uses as much as digits as its factorization.

25535197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47250, while the sum is 37.

The square root of 25535197 is about 5053.2362897454. The cubic root of 25535197 is about 294.4736261203.

It can be divided in two parts, 2553 and 5197, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 25535197 in words is "twenty-five million, five hundred thirty-five thousand, one hundred ninety-seven".