213156646 has 16 divisors (see below), whose sum is σ = 325731744. Its totient is φ = 104598144.

The previous prime is 213156599. The next prime is 213156679. The reversal of 213156646 is 646651312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18700 + ... + 27856.

It is an arithmetic number, because the mean of its divisors is an integer number (20358234).

Almost surely, 2^213156646 is an apocalyptic number.

213156646 is a deficient number, since it is larger than the sum of its proper divisors (112575098).

213156646 is a wasteful number, since it uses less digits than its factorization.

213156646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9375.

The product of its digits is 25920, while the sum is 34.

The square root of 213156646 is about 14599.8851365345. The cubic root of 213156646 is about 597.3556274259.

The spelling of 213156646 in words is "two hundred thirteen million, one hundred fifty-six thousand, six hundred forty-six".