215312481 has 24 divisors (see below), whose sum is σ = 319569536. Its totient is φ = 139618080.

The previous prime is 215312479. The next prime is 215312483. The reversal of 215312481 is 184213512.

It is an interprime number because it is at equal distance from previous prime (215312479) and next prime (215312483).

It is not a de Polignac number, because 215312481 - 2¹ = 215312479 is a prime.

It is a super-2 number, since 2×215312481² = 92718928948750722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215312483) 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 23 ways as a sum of consecutive naturals, for example, 103851 + ... + 105903.

Almost surely, 2^215312481 is an apocalyptic number.

It is an amenable number.

215312481 is a deficient number, since it is larger than the sum of its proper divisors (104257055).

215312481 is a wasteful number, since it uses less digits than its factorization.

215312481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373 (or 2370 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 215312481 is about 14673.5299434049. The cubic root of 215312481 is about 599.3627317215.

Adding to 215312481 its reverse (184213512), we get a palindrome (399525993).

The spelling of 215312481 in words is "two hundred fifteen million, three hundred twelve thousand, four hundred eighty-one".