215855061 has 16 divisors (see below), whose sum is σ = 295138944. Its totient is φ = 140272704.

The previous prime is 215855053. The next prime is 215855063. The reversal of 215855061 is 160558512.

It is not a de Polignac number, because 215855061 - 2³ = 215855053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215855063) 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 15 ways as a sum of consecutive naturals, for example, 20640 + ... + 29286.

It is an arithmetic number, because the mean of its divisors is an integer number (18446184).

Almost surely, 2^215855061 is an apocalyptic number.

It is an amenable number.

215855061 is a deficient number, since it is larger than the sum of its proper divisors (79283883).

215855061 is a wasteful number, since it uses less digits than its factorization.

215855061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8860.

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 215855061 is about 14692.0067043274. The cubic root of 215855061 is about 599.8657671937.

The spelling of 215855061 in words is "two hundred fifteen million, eight hundred fifty-five thousand, sixty-one".