215131473 has 12 divisors (see below), whose sum is σ = 311742340. Its totient is φ = 142960896.

The previous prime is 215131459. The next prime is 215131493. The reversal of 215131473 is 374131512.

215131473 is a `hidden beast` number, since 2 + 1 + 513 + 147 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19607184 + 195524289 = 4428^2 + 13983^2 .

It is not a de Polignac number, because 215131473 - 2⁶ = 215131409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215131403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35368 + ... + 41001.

Almost surely, 2^215131473 is an apocalyptic number.

It is an amenable number.

215131473 is a deficient number, since it is larger than the sum of its proper divisors (96610867).

215131473 is a wasteful number, since it uses less digits than its factorization.

215131473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76688 (or 76685 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 215131473 is about 14667.3608055437. The cubic root of 215131473 is about 599.1947280453.

Adding to 215131473 its reverse (374131512), we get a palindrome (589262985).

The spelling of 215131473 in words is "two hundred fifteen million, one hundred thirty-one thousand, four hundred seventy-three".