215871797 has 8 divisors (see below), whose sum is σ = 229485312. Its totient is φ = 202360000.

The previous prime is 215871793. The next prime is 215871827. The reversal of 215871797 is 797178512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215871797 - 2² = 215871793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215871791) 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 7 ways as a sum of consecutive naturals, for example, 21029 + ... + 29562.

It is an arithmetic number, because the mean of its divisors is an integer number (28685664).

Almost surely, 2^215871797 is an apocalyptic number.

It is an amenable number.

215871797 is a deficient number, since it is larger than the sum of its proper divisors (13613515).

215871797 is a wasteful number, since it uses less digits than its factorization.

215871797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50859.

The product of its digits is 246960, while the sum is 47.

The square root of 215871797 is about 14692.5762546941. The cubic root of 215871797 is about 599.8812700254.

The spelling of 215871797 in words is "two hundred fifteen million, eight hundred seventy-one thousand, seven hundred ninety-seven".