215563252 has 6 divisors (see below), whose sum is σ = 377235698. Its totient is φ = 107781624.

The previous prime is 215563237. The next prime is 215563261. The reversal of 215563252 is 252365512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 196168036 + 19395216 = 14006^2 + 4404^2 .

It is a super-3 number, since 3×215563252³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 26945403 + ... + 26945410.

Almost surely, 2^215563252 is an apocalyptic number.

It is an amenable number.

215563252 is a deficient number, since it is larger than the sum of its proper divisors (161672446).

215563252 is a wasteful number, since it uses less digits than its factorization.

215563252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53890817 (or 53890815 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 215563252 is about 14682.0724695119. The cubic root of 215563252 is about 599.5953308365.

The spelling of 215563252 in words is "two hundred fifteen million, five hundred sixty-three thousand, two hundred fifty-two".