213165243 has 8 divisors (see below), whose sum is σ = 315800400. Its totient is φ = 142110144.

The previous prime is 213165221. The next prime is 213165307. The reversal of 213165243 is 342561312.

213165243 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 652 + 4 + 3 = 666.

It is not a de Polignac number, because 213165243 - 2⁶ = 213165179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7895009 = 213165243 / (2 + 1 + 3 + 1 + 6 + 5 + 2 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (213165203) 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, 3947478 + ... + 3947531.

It is an arithmetic number, because the mean of its divisors is an integer number (39475050).

Almost surely, 2^213165243 is an apocalyptic number.

213165243 is a deficient number, since it is larger than the sum of its proper divisors (102635157).

213165243 is an equidigital number, since it uses as much as digits as its factorization.

213165243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7895018 (or 7895012 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 213165243 is about 14600.1795536904. The cubic root of 213165243 is about 597.3636581354.

The spelling of 213165243 in words is "two hundred thirteen million, one hundred sixty-five thousand, two hundred forty-three".