213158817 has 8 divisors (see below), whose sum is σ = 315790880. Its totient is φ = 142105860.

The previous prime is 213158807. The next prime is 213158819. The reversal of 213158817 is 718851312.

It is not a de Polignac number, because 213158817 - 2⁷ = 213158689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213158819) 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 7 ways as a sum of consecutive naturals, for example, 3947359 + ... + 3947412.

It is an arithmetic number, because the mean of its divisors is an integer number (39473860).

Almost surely, 2^213158817 is an apocalyptic number.

213158817 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

213158817 is a deficient number, since it is larger than the sum of its proper divisors (102632063).

213158817 is an equidigital number, since it uses as much as digits as its factorization.

213158817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7894780 (or 7894774 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 213158817 is about 14599.9594862452. The cubic root of 213158817 is about 597.3576554409.

The spelling of 213158817 in words is "two hundred thirteen million, one hundred fifty-eight thousand, eight hundred seventeen".