213145181 has 16 divisors (see below), whose sum is σ = 225566208. Its totient is φ = 201139200.

The previous prime is 213145151. The next prime is 213145187. The reversal of 213145181 is 181541312.

It is not a de Polignac number, because 213145181 - 2¹⁰ = 213144157 is a prime.

It is a super-2 number, since 2×213145181² = 90861736367045522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213145181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213145187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219026 + ... + 219996.

It is an arithmetic number, because the mean of its divisors is an integer number (14097888).

Almost surely, 2^213145181 is an apocalyptic number.

It is an amenable number.

213145181 is a deficient number, since it is larger than the sum of its proper divisors (12421027).

213145181 is an equidigital number, since it uses as much as digits as its factorization.

213145181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172.

The product of its digits is 960, while the sum is 26.

The square root of 213145181 is about 14599.4924911793. The cubic root of 213145181 is about 597.3449172976.

Adding to 213145181 its reverse (181541312), we get a palindrome (394686493).

The spelling of 213145181 in words is "two hundred thirteen million, one hundred forty-five thousand, one hundred eighty-one".