25720169 has 2 divisors, whose sum is σ = 25720170. Its totient is φ = 25720168.

The previous prime is 25720159. The next prime is 25720181. The reversal of 25720169 is 96102752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14160169 + 11560000 = 3763^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 25720169 - 2²⁰ = 24671593 is a prime.

It is a super-2 number, since 2×25720169² = 1323054186777122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25720159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860084 + 12860085.

It is an arithmetic number, because the mean of its divisors is an integer number (12860085).

Almost surely, 2^25720169 is an apocalyptic number.

It is an amenable number.

25720169 is a deficient number, since it is larger than the sum of its proper divisors (1).

25720169 is an equidigital number, since it uses as much as digits as its factorization.

25720169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 25720169 is about 5071.5055949885. The cubic root of 25720169 is about 295.1829526819.

The spelling of 25720169 in words is "twenty-five million, seven hundred twenty thousand, one hundred sixty-nine".