215134643 has 4 divisors (see below), whose sum is σ = 227789640. Its totient is φ = 202479648.

The previous prime is 215134639. The next prime is 215134649. The reversal of 215134643 is 346431512.

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

It is a cyclic number.

It is not a de Polignac number, because 215134643 - 2² = 215134639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215134649) 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, 6327473 + ... + 6327506.

It is an arithmetic number, because the mean of its divisors is an integer number (56947410).

Almost surely, 2^215134643 is an apocalyptic number.

215134643 is a deficient number, since it is larger than the sum of its proper divisors (12654997).

215134643 is a wasteful number, since it uses less digits than its factorization.

215134643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12654996.

The product of its digits is 8640, while the sum is 29.

The square root of 215134643 is about 14667.4688682131. The cubic root of 215134643 is about 599.1976711107.

The spelling of 215134643 in words is "two hundred fifteen million, one hundred thirty-four thousand, six hundred forty-three".