215830861 has 16 divisors (see below), whose sum is σ = 241963200. Its totient is φ = 191317248.

The previous prime is 215830859. The next prime is 215830891. The reversal of 215830861 is 168038512.

It is a cyclic number.

It is not a de Polignac number, because 215830861 - 2¹ = 215830859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215830831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55951 + ... + 59683.

It is an arithmetic number, because the mean of its divisors is an integer number (15122700).

Almost surely, 2^215830861 is an apocalyptic number.

It is an amenable number.

215830861 is a deficient number, since it is larger than the sum of its proper divisors (26132339).

215830861 is a wasteful number, since it uses less digits than its factorization.

215830861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3948.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 215830861 is about 14691.1831041615. The cubic root of 215830861 is about 599.8433489191.

The spelling of 215830861 in words is "two hundred fifteen million, eight hundred thirty thousand, eight hundred sixty-one".