215209093 has 4 divisors (see below), whose sum is σ = 234773568. Its totient is φ = 195644620.

The previous prime is 215209073. The next prime is 215209117. The reversal of 215209093 is 390902512.

215209093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215209093 - 2⁵ = 215209061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215209003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9782221 + ... + 9782242.

It is an arithmetic number, because the mean of its divisors is an integer number (58693392).

Almost surely, 2^215209093 is an apocalyptic number.

It is an amenable number.

215209093 is a deficient number, since it is larger than the sum of its proper divisors (19564475).

215209093 is a wasteful number, since it uses less digits than its factorization.

215209093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19564474.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 215209093 is about 14670.0065780490. The cubic root of 215209093 is about 599.2667830569.

The spelling of 215209093 in words is "two hundred fifteen million, two hundred nine thousand, ninety-three".