213632161 has 4 divisors (see below), whose sum is σ = 215314432. Its totient is φ = 211949892.

The previous prime is 213632141. The next prime is 213632171. The reversal of 213632161 is 161236312.

213632161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213632161 - 2⁷ = 213632033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213632101) 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, 840945 + ... + 841198.

It is an arithmetic number, because the mean of its divisors is an integer number (53828608).

Almost surely, 2^213632161 is an apocalyptic number.

It is an amenable number.

213632161 is a deficient number, since it is larger than the sum of its proper divisors (1682271).

213632161 is a wasteful number, since it uses less digits than its factorization.

213632161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682270.

The product of its digits is 1296, while the sum is 25.

The square root of 213632161 is about 14616.1609528631. The cubic root of 213632161 is about 597.7994959843.

Adding to 213632161 its reverse (161236312), we get a palindrome (374868473).

The spelling of 213632161 in words is "two hundred thirteen million, six hundred thirty-two thousand, one hundred sixty-one".