215946861 has 16 divisors (see below), whose sum is σ = 310390080. Its totient is φ = 132756480.

The previous prime is 215946851. The next prime is 215946883. The reversal of 215946861 is 168649512.

It is not a de Polignac number, because 215946861 - 2²¹ = 213849709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215946821) 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 15 ways as a sum of consecutive naturals, for example, 48205 + ... + 52493.

It is an arithmetic number, because the mean of its divisors is an integer number (19399380).

Almost surely, 2^215946861 is an apocalyptic number.

It is an amenable number.

215946861 is a deficient number, since it is larger than the sum of its proper divisors (94443219).

215946861 is a wasteful number, since it uses less digits than its factorization.

215946861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5596.

The product of its digits is 103680, while the sum is 42.

The square root of 215946861 is about 14695.1305200056. The cubic root of 215946861 is about 599.9507931868.

The spelling of 215946861 in words is "two hundred fifteen million, nine hundred forty-six thousand, eight hundred sixty-one".