215115273 has 6 divisors (see below), whose sum is σ = 310722074. Its totient is φ = 143410176.

The previous prime is 215115269. The next prime is 215115281. The reversal of 215115273 is 372511512.

It can be written as a sum of positive squares in only one way, i.e., 157552704 + 57562569 = 12552^2 + 7587^2 .

It is not a de Polignac number, because 215115273 - 2² = 215115269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215115223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11950840 + ... + 11950857.

Almost surely, 2^215115273 is an apocalyptic number.

It is an amenable number.

215115273 is a deficient number, since it is larger than the sum of its proper divisors (95606801).

215115273 is a wasteful number, since it uses less digits than its factorization.

215115273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23901703 (or 23901700 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 215115273 is about 14666.8085485562. The cubic root of 215115273 is about 599.1796873230.

Adding to 215115273 its reverse (372511512), we get a palindrome (587626785).

It can be divided in two parts, 2151 and 15273, that added together give a square (17424 = 132²).

The spelling of 215115273 in words is "two hundred fifteen million, one hundred fifteen thousand, two hundred seventy-three".