25511161 has 4 divisors (see below), whose sum is σ = 27473572. Its totient is φ = 23548752.

The previous prime is 25511149. The next prime is 25511201. The reversal of 25511161 is 16111552.

It is a happy number.

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 5035536 + 20475625 = 2244^2 + 4525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25511161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25511861) 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, 981186 + ... + 981211.

It is an arithmetic number, because the mean of its divisors is an integer number (6868393).

Almost surely, 2^25511161 is an apocalyptic number.

It is an amenable number.

25511161 is a deficient number, since it is larger than the sum of its proper divisors (1962411).

25511161 is a wasteful number, since it uses less digits than its factorization.

25511161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962410.

The product of its digits is 300, while the sum is 22.

The square root of 25511161 is about 5050.8574519580. The cubic root of 25511161 is about 294.3812021869.

The spelling of 25511161 in words is "twenty-five million, five hundred eleven thousand, one hundred sixty-one".