215797093 has 4 divisors (see below), whose sum is σ = 215827648. Its totient is φ = 215766540.

The previous prime is 215797081. The next prime is 215797097. The reversal of 215797093 is 390797512.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 215797093 - 2¹⁷ = 215666021 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 (215797097) 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, 1348 + ... + 20818.

It is an arithmetic number, because the mean of its divisors is an integer number (53956912).

Almost surely, 2^215797093 is an apocalyptic number.

It is an amenable number.

215797093 is a deficient number, since it is larger than the sum of its proper divisors (30555).

215797093 is a wasteful number, since it uses less digits than its factorization.

215797093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30554.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 215797093 is about 14690.0337984635. The cubic root of 215797093 is about 599.8120642879.

The spelling of 215797093 in words is "two hundred fifteen million, seven hundred ninety-seven thousand, ninety-three".