215652061 has 4 divisors (see below), whose sum is σ = 215897724. Its totient is φ = 215406400.

The previous prime is 215652053. The next prime is 215652077. The reversal of 215652061 is 160256512.

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 14295961 + 201356100 = 3781^2 + 14190^2 .

It is a cyclic number.

It is not a de Polignac number, because 215652061 - 2³ = 215652053 is a prime.

It is a super-2 number, since 2×215652061² = 93011622827095442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215652161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121510 + ... + 123271.

It is an arithmetic number, because the mean of its divisors is an integer number (53974431).

Almost surely, 2^215652061 is an apocalyptic number.

It is an amenable number.

215652061 is a deficient number, since it is larger than the sum of its proper divisors (245663).

215652061 is an equidigital number, since it uses as much as digits as its factorization.

215652061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245662.

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

The square root of 215652061 is about 14685.0965607993. The cubic root of 215652061 is about 599.6776611197.

The spelling of 215652061 in words is "two hundred fifteen million, six hundred fifty-two thousand, sixty-one".