215116475 has 12 divisors (see below), whose sum is σ = 304851024. Its totient is φ = 147508320.

The previous prime is 215116469. The next prime is 215116477. The reversal of 215116475 is 574611512.

It is not a de Polignac number, because 215116475 - 2⁶ = 215116411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215116477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 614444 + ... + 614793.

It is an arithmetic number, because the mean of its divisors is an integer number (25404252).

Almost surely, 2^215116475 is an apocalyptic number.

215116475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215116475 is a deficient number, since it is larger than the sum of its proper divisors (89734549).

215116475 is a wasteful number, since it uses less digits than its factorization.

215116475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229254 (or 1229249 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 215116475 is about 14666.8495253752. The cubic root of 215116475 is about 599.1808033334.

Adding to 215116475 its reverse (574611512), we get a palindrome (789727987).

The spelling of 215116475 in words is "two hundred fifteen million, one hundred sixteen thousand, four hundred seventy-five".