215506713 has 4 divisors (see below), whose sum is σ = 287342288. Its totient is φ = 143671140.

The previous prime is 215506693. The next prime is 215506723. The reversal of 215506713 is 317605512.

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 not a de Polignac number, because 215506713 - 2⁸ = 215506457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215506723) 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, 35917783 + ... + 35917788.

It is an arithmetic number, because the mean of its divisors is an integer number (71835572).

Almost surely, 2^215506713 is an apocalyptic number.

It is an amenable number.

215506713 is a deficient number, since it is larger than the sum of its proper divisors (71835575).

215506713 is an equidigital number, since it uses as much as digits as its factorization.

215506713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71835574.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 215506713 is about 14680.1468998100. The cubic root of 215506713 is about 599.5429046393.

The spelling of 215506713 in words is "two hundred fifteen million, five hundred six thousand, seven hundred thirteen".