25162561 has 8 divisors (see below), whose sum is σ = 26201448. Its totient is φ = 24144000.

The previous prime is 25162559. The next prime is 25162573. The reversal of 25162561 is 16526152.

It can be written as a sum of positive squares in 4 ways, for example, as 600625 + 24561936 = 775^2 + 4956^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25162561 - 2¹ = 25162559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25162961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2530 + ... + 7531.

It is an arithmetic number, because the mean of its divisors is an integer number (3275181).

Almost surely, 2^25162561 is an apocalyptic number.

It is an amenable number.

25162561 is a deficient number, since it is larger than the sum of its proper divisors (1038887).

25162561 is a wasteful number, since it uses less digits than its factorization.

25162561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10163.

The product of its digits is 3600, while the sum is 28.

The square root of 25162561 is about 5016.2297594907. The cubic root of 25162561 is about 293.0341800644.

The spelling of 25162561 in words is "twenty-five million, one hundred sixty-two thousand, five hundred sixty-one".