215810093 has 2 divisors, whose sum is σ = 215810094. Its totient is φ = 215810092.

The previous prime is 215810071. The next prime is 215810143. The reversal of 215810093 is 390018512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134142724 + 81667369 = 11582^2 + 9037^2 .

It is a cyclic number.

It is not a de Polignac number, because 215810093 - 2⁸ = 215809837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215810293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107905046 + 107905047.

It is an arithmetic number, because the mean of its divisors is an integer number (107905047).

Almost surely, 2^215810093 is an apocalyptic number.

It is an amenable number.

215810093 is a deficient number, since it is larger than the sum of its proper divisors (1).

215810093 is an equidigital number, since it uses as much as digits as its factorization.

215810093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 215810093 is about 14690.4762686579. The cubic root of 215810093 is about 599.8241086273.

The spelling of 215810093 in words is "two hundred fifteen million, eight hundred ten thousand, ninety-three".