215981801 has 8 divisors (see below), whose sum is σ = 247141440. Its totient is φ = 184898448.

The previous prime is 215981783. The next prime is 215981827. The reversal of 215981801 is 108189512.

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

It is a de Polignac number, because none of the positive numbers 2^k-215981801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215986801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12866 + ... + 24443.

It is an arithmetic number, because the mean of its divisors is an integer number (30892680).

Almost surely, 2^215981801 is an apocalyptic number.

It is an amenable number.

215981801 is a deficient number, since it is larger than the sum of its proper divisors (31159639).

215981801 is an equidigital number, since it uses as much as digits as its factorization.

215981801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38143.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 215981801 is about 14696.3193011039. The cubic root of 215981801 is about 599.9831486008.

The spelling of 215981801 in words is "two hundred fifteen million, nine hundred eighty-one thousand, eight hundred one".