25517497 has 2 divisors, whose sum is σ = 25517498. Its totient is φ = 25517496.

The previous prime is 25517491. The next prime is 25517521. The reversal of 25517497 is 79471552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25040016 + 477481 = 5004^2 + 691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25517497 is a prime.

It is a super-2 number, since 2×25517497² = 1302285306290018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25517491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12758748 + 12758749.

It is an arithmetic number, because the mean of its divisors is an integer number (12758749).

Almost surely, 2^25517497 is an apocalyptic number.

It is an amenable number.

25517497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25517497 is an equidigital number, since it uses as much as digits as its factorization.

25517497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 40.

The square root of 25517497 is about 5051.4846332539. The cubic root of 25517497 is about 294.4055711929.

The spelling of 25517497 in words is "twenty-five million, five hundred seventeen thousand, four hundred ninety-seven".