215563 has 2 divisors, whose sum is σ = 215564. Its totient is φ = 215562.

The previous prime is 215531. The next prime is 215573. The reversal of 215563 is 365512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215563 - 2⁵ = 215531 is a prime.

It is equal to p₁₉₂₅₅ and since 215563 and 19255 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (215503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107781 + 107782.

It is an arithmetic number, because the mean of its divisors is an integer number (107782).

2²¹⁵⁵⁶³ is an apocalyptic number.

215563 is a deficient number, since it is larger than the sum of its proper divisors (1).

215563 is an equidigital number, since it uses as much as digits as its factorization.

215563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 22.

The square root of 215563 is about 464.2876263697. The cubic root of 215563 is about 59.9595097188.

The spelling of 215563 in words is "two hundred fifteen thousand, five hundred sixty-three".