213545231 has 2 divisors, whose sum is σ = 213545232. Its totient is φ = 213545230.

The previous prime is 213545203. The next prime is 213545243. The reversal of 213545231 is 132545312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213545231 - 2¹⁰ = 213544207 is a prime.

It is a super-2 number, since 2×213545231² = 91203131365686722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 213545231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213545251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106772615 + 106772616.

It is an arithmetic number, because the mean of its divisors is an integer number (106772616).

Almost surely, 2^213545231 is an apocalyptic number.

213545231 is a deficient number, since it is larger than the sum of its proper divisors (1).

213545231 is an equidigital number, since it uses as much as digits as its factorization.

213545231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 26.

The square root of 213545231 is about 14613.1868871920. The cubic root of 213545231 is about 597.7184005784.

The spelling of 213545231 in words is "two hundred thirteen million, five hundred forty-five thousand, two hundred thirty-one".