25616197 has 2 divisors, whose sum is σ = 25616198. Its totient is φ = 25616196.

The previous prime is 25616191. The next prime is 25616243. The reversal of 25616197 is 79161652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 224676 = 5039^2 + 474^2 .

It is a cyclic number.

It is not a de Polignac number, because 25616197 - 2²³ = 17227589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25616191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12808098 + 12808099.

It is an arithmetic number, because the mean of its divisors is an integer number (12808099).

Almost surely, 2^25616197 is an apocalyptic number.

It is an amenable number.

25616197 is a deficient number, since it is larger than the sum of its proper divisors (1).

25616197 is an equidigital number, since it uses as much as digits as its factorization.

25616197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 25616197 is about 5061.2446097773. The cubic root of 25616197 is about 294.7846633061.

The spelling of 25616197 in words is "twenty-five million, six hundred sixteen thousand, one hundred ninety-seven".