215008993 has 4 divisors (see below), whose sum is σ = 216296640. Its totient is φ = 213721348.

The previous prime is 215008951. The next prime is 215008999. The reversal of 215008993 is 399800512.

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 215008993 - 2¹³ = 215000801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215008999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643573 + ... + 643906.

It is an arithmetic number, because the mean of its divisors is an integer number (54074160).

Almost surely, 2^215008993 is an apocalyptic number.

It is an amenable number.

215008993 is a deficient number, since it is larger than the sum of its proper divisors (1287647).

215008993 is a wasteful number, since it uses less digits than its factorization.

215008993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287646.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 215008993 is about 14663.1849541633. The cubic root of 215008993 is about 599.0809940246.

The spelling of 215008993 in words is "two hundred fifteen million, eight thousand, nine hundred ninety-three".