215025161 has 4 divisors (see below), whose sum is σ = 231565572. Its totient is φ = 198484752.

The previous prime is 215025149. The next prime is 215025203. The reversal of 215025161 is 161520512.

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 35331136 + 179694025 = 5944^2 + 13405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215025161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215025121) 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, 8270186 + ... + 8270211.

It is an arithmetic number, because the mean of its divisors is an integer number (57891393).

Almost surely, 2^215025161 is an apocalyptic number.

It is an amenable number.

215025161 is a deficient number, since it is larger than the sum of its proper divisors (16540411).

215025161 is a wasteful number, since it uses less digits than its factorization.

215025161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16540410.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 215025161 is about 14663.7362564934. The cubic root of 215025161 is about 599.0960099837.

Adding to 215025161 its reverse (161520512), we get a palindrome (376545673).

The spelling of 215025161 in words is "two hundred fifteen million, twenty-five thousand, one hundred sixty-one".