215573 has 2 divisors, whose sum is σ = 215574. Its totient is φ = 215572.

The previous prime is 215563. The next prime is 215587. The reversal of 215573 is 375512.

215573 is nontrivially palindromic in base 13.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208849 + 6724 = 457^2 + 82^2 .

It is a cyclic number.

It is not a de Polignac number, because 215573 - 2⁸ = 215317 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₁₉₂₅₆ and since 215573 and 19256 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

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, 107786 + 107787.

It is an arithmetic number, because the mean of its divisors is an integer number (107787).

2²¹⁵⁵⁷³ is an apocalyptic number.

It is an amenable number.

215573 is a deficient number, since it is larger than the sum of its proper divisors (1).

215573 is an equidigital number, since it uses as much as digits as its factorization.

215573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1050, while the sum is 23.

The square root of 215573 is about 464.2983954312. The cubic root of 215573 is about 59.9604368814.

The spelling of 215573 in words is "two hundred fifteen thousand, five hundred seventy-three".