213694851 has 4 divisors (see below), whose sum is σ = 284926472. Its totient is φ = 142463232.

The previous prime is 213694813. The next prime is 213694867. The reversal of 213694851 is 158496312.

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

It is a de Polignac number, because none of the positive numbers 2^k-213694851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213694801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35615806 + ... + 35615811.

It is an arithmetic number, because the mean of its divisors is an integer number (71231618).

Almost surely, 2^213694851 is an apocalyptic number.

213694851 is a deficient number, since it is larger than the sum of its proper divisors (71231621).

213694851 is an equidigital number, since it uses as much as digits as its factorization.

213694851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71231620.

The product of its digits is 51840, while the sum is 39.

The square root of 213694851 is about 14618.3053395392. The cubic root of 213694851 is about 597.8579646859.

The spelling of 213694851 in words is "two hundred thirteen million, six hundred ninety-four thousand, eight hundred fifty-one".