215061 has 32 divisors (see below), whose sum is σ = 384000. Its totient is φ = 105840.

The previous prime is 215051. The next prime is 215063. The reversal of 215061 is 160512.

It is a de Polignac number, because none of the positive numbers 2^k-215061 is a prime.

215061 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 215061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11310 + ... + 11328.

It is an arithmetic number, because the mean of its divisors is an integer number (12000).

2²¹⁵⁰⁶¹ is an apocalyptic number.

215061 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

215061 is a deficient number, since it is larger than the sum of its proper divisors (168939).

215061 is a wasteful number, since it uses less digits than its factorization.

215061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 215061 is about 463.7466981015. The cubic root of 215061 is about 59.9129292615.

Adding to 215061 its reverse (160512), we get a palindrome (375573).

It can be divided in two parts, 2150 and 61, that added together give a triangular number (2211 = T₆₆).

The spelling of 215061 in words is "two hundred fifteen thousand, sixty-one".