215162561 has 4 divisors (see below), whose sum is σ = 215197632. Its totient is φ = 215127492.

The previous prime is 215162533. The next prime is 215162567. The reversal of 215162561 is 165261512.

It is a happy number.

215162561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215162561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215162567) 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, 5645 + ... + 21498.

It is an arithmetic number, because the mean of its divisors is an integer number (53799408).

Almost surely, 2^215162561 is an apocalyptic number.

It is an amenable number.

215162561 is a deficient number, since it is larger than the sum of its proper divisors (35071).

215162561 is an equidigital number, since it uses as much as digits as its factorization.

215162561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35070.

The product of its digits is 3600, while the sum is 29.

The square root of 215162561 is about 14668.4205352860. The cubic root of 215162561 is about 599.2235892625.

The spelling of 215162561 in words is "two hundred fifteen million, one hundred sixty-two thousand, five hundred sixty-one".