213437845 has 4 divisors (see below), whose sum is σ = 256125420. Its totient is φ = 170750272.

The previous prime is 213437831. The next prime is 213437891. The reversal of 213437845 is 548734312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36893476 + 176544369 = 6074^2 + 13287^2 .

It is a cyclic number.

It is not a de Polignac number, because 213437845 - 2⁹ = 213437333 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21343780 + ... + 21343789.

It is an arithmetic number, because the mean of its divisors is an integer number (64031355).

Almost surely, 2^213437845 is an apocalyptic number.

It is an amenable number.

213437845 is a deficient number, since it is larger than the sum of its proper divisors (42687575).

213437845 is an equidigital number, since it uses as much as digits as its factorization.

213437845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42687574.

The product of its digits is 80640, while the sum is 37.

The square root of 213437845 is about 14609.5121410675. The cubic root of 213437845 is about 597.6181917528.

The spelling of 213437845 in words is "two hundred thirteen million, four hundred thirty-seven thousand, eight hundred forty-five".