215994049 has 4 divisors (see below), whose sum is σ = 221831764. Its totient is φ = 210156336.

The previous prime is 215994047. The next prime is 215994067. The reversal of 215994049 is 940499512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202066225 + 13927824 = 14215^2 + 3732^2 .

It is a cyclic number.

It is not a de Polignac number, because 215994049 - 2¹ = 215994047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215993996 and 215994014.

It is not an unprimeable number, because it can be changed into a prime (215994043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2918802 + ... + 2918875.

It is an arithmetic number, because the mean of its divisors is an integer number (55457941).

Almost surely, 2^215994049 is an apocalyptic number.

It is an amenable number.

215994049 is a deficient number, since it is larger than the sum of its proper divisors (5837715).

215994049 is an equidigital number, since it uses as much as digits as its factorization.

215994049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5837714.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 215994049 is about 14696.7359981732. The cubic root of 215994049 is about 599.9944897642.

The spelling of 215994049 in words is "two hundred fifteen million, nine hundred ninety-four thousand, forty-nine".