213251185 has 12 divisors (see below), whose sum is σ = 297681588. Its totient is φ = 146229216.

The previous prime is 213251167. The next prime is 213251189. The reversal of 213251185 is 581152312.

It can be written as a sum of positive squares in 2 ways, for example, as 116661601 + 96589584 = 10801^2 + 9828^2 .

It is not a de Polignac number, because 213251185 - 2⁷ = 213251057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213251189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434962 + ... + 435451.

It is an arithmetic number, because the mean of its divisors is an integer number (24806799).

Almost surely, 2^213251185 is an apocalyptic number.

It is an amenable number.

213251185 is a deficient number, since it is larger than the sum of its proper divisors (84430403).

213251185 is an equidigital number, since it uses as much as digits as its factorization.

213251185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870432 (or 870425 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

The square root of 213251185 is about 14603.1224400811. The cubic root of 213251185 is about 597.4439272088.

The spelling of 213251185 in words is "two hundred thirteen million, two hundred fifty-one thousand, one hundred eighty-five".