213517139 has 4 divisors (see below), whose sum is σ = 232927800. Its totient is φ = 194106480.

The previous prime is 213517133. The next prime is 213517159. The reversal of 213517139 is 931715312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213517139 - 2⁸ = 213516883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213517133) 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 3 ways as a sum of consecutive naturals, for example, 9705314 + ... + 9705335.

It is an arithmetic number, because the mean of its divisors is an integer number (58231950).

Almost surely, 2^213517139 is an apocalyptic number.

213517139 is a deficient number, since it is larger than the sum of its proper divisors (19410661).

213517139 is a wasteful number, since it uses less digits than its factorization.

213517139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19410660.

The product of its digits is 5670, while the sum is 32.

The square root of 213517139 is about 14612.2256689390. The cubic root of 213517139 is about 597.6921893606.

The spelling of 213517139 in words is "two hundred thirteen million, five hundred seventeen thousand, one hundred thirty-nine".