215136819 has 24 divisors (see below), whose sum is σ = 340385760. Its totient is φ = 130330368.

The previous prime is 215136811. The next prime is 215136847. The reversal of 215136819 is 918631512.

It is not a de Polignac number, because 215136819 - 2³ = 215136811 is a prime.

It is a super-2 number, since 2×215136819² = 92567701778877522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215136811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19807 + ... + 28680.

It is an arithmetic number, because the mean of its divisors is an integer number (14182740).

Almost surely, 2^215136819 is an apocalyptic number.

215136819 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

215136819 is a deficient number, since it is larger than the sum of its proper divisors (125248941).

215136819 is a wasteful number, since it uses less digits than its factorization.

215136819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48539 (or 48536 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 215136819 is about 14667.5430457865. The cubic root of 215136819 is about 599.1996913180.

The spelling of 215136819 in words is "two hundred fifteen million, one hundred thirty-six thousand, eight hundred nineteen".