213163531 has 8 divisors (see below), whose sum is σ = 245534720. Its totient is φ = 181272168.

The previous prime is 213163523. The next prime is 213163541. The reversal of 213163531 is 135361312.

213163531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213163531 - 2³ = 213163523 is a prime.

It is a super-2 number, since 2×213163531² = 90877381896775922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213163496 and 213163505.

It is not an unprimeable number, because it can be changed into a prime (213163501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119001 + ... + 120778.

It is an arithmetic number, because the mean of its divisors is an integer number (30691840).

Almost surely, 2^213163531 is an apocalyptic number.

213163531 is a deficient number, since it is larger than the sum of its proper divisors (32371189).

213163531 is a wasteful number, since it uses less digits than its factorization.

213163531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239913.

The product of its digits is 1620, while the sum is 25.

The square root of 213163531 is about 14600.1209241568. The cubic root of 213163531 is about 597.3620589232.

The spelling of 213163531 in words is "two hundred thirteen million, one hundred sixty-three thousand, five hundred thirty-one".