215031055 has 8 divisors (see below), whose sum is σ = 260698032. Its totient is φ = 170251008.

The previous prime is 215031053. The next prime is 215031107. The reversal of 215031055 is 550130512.

215031055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 215031055 - 2¹ = 215031053 is a prime.

It is a super-2 number, since 2×215031055² = 92476709228826050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215031053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221197 + ... + 222166.

It is an arithmetic number, because the mean of its divisors is an integer number (32587254).

Almost surely, 2^215031055 is an apocalyptic number.

215031055 is a deficient number, since it is larger than the sum of its proper divisors (45666977).

215031055 is an equidigital number, since it uses as much as digits as its factorization.

215031055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443465.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 215031055 is about 14663.9372270888. The cubic root of 215031055 is about 599.1014838232.

Adding to 215031055 its reverse (550130512), we get a palindrome (765161567).

The spelling of 215031055 in words is "two hundred fifteen million, thirty-one thousand, fifty-five".