25056161 has 4 divisors (see below), whose sum is σ = 26983572. Its totient is φ = 23128752.

The previous prime is 25056151. The next prime is 25056169. The reversal of 25056161 is 16165052.

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 12496225 + 12559936 = 3535^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 25056161 - 2¹⁰ = 25055137 is a prime.

It is a super-2 number, since 2×25056161² = 1255622408115842, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25056161.

It is not an unprimeable number, because it can be changed into a prime (25056169) 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, 963686 + ... + 963711.

It is an arithmetic number, because the mean of its divisors is an integer number (6745893).

Almost surely, 2^25056161 is an apocalyptic number.

It is an amenable number.

25056161 is a deficient number, since it is larger than the sum of its proper divisors (1927411).

25056161 is a wasteful number, since it uses less digits than its factorization.

25056161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927410.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25056161 is about 5005.6129494798. The cubic root of 25056161 is about 292.6205644166.

The spelling of 25056161 in words is "twenty-five million, fifty-six thousand, one hundred sixty-one".