25173161 has 4 divisors (see below), whose sum is σ = 27109572. Its totient is φ = 23236752.

The previous prime is 25173143. The next prime is 25173163. The reversal of 25173161 is 16137152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10118761 + 15054400 = 3181^2 + 3880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25173161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25173161.

It is not an unprimeable number, because it can be changed into a prime (25173163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968186 + ... + 968211.

It is an arithmetic number, because the mean of its divisors is an integer number (6777393).

Almost surely, 2^25173161 is an apocalyptic number.

It is an amenable number.

25173161 is a deficient number, since it is larger than the sum of its proper divisors (1936411).

25173161 is a wasteful number, since it uses less digits than its factorization.

25173161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936410.

The product of its digits is 1260, while the sum is 26.

The square root of 25173161 is about 5017.2862186644. The cubic root of 25173161 is about 293.0753222232.

The spelling of 25173161 in words is "twenty-five million, one hundred seventy-three thousand, one hundred sixty-one".