213804145 has 8 divisors (see below), whose sum is σ = 256706856. Its totient is φ = 170948736.

The previous prime is 213804109. The next prime is 213804161. The reversal of 213804145 is 541408312.

It can be written as a sum of positive squares in 4 ways, for example, as 50680161 + 163123984 = 7119^2 + 12772^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213804145 - 2¹¹ = 213802097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 972 + ... + 20701.

It is an arithmetic number, because the mean of its divisors is an integer number (32088357).

Almost surely, 2^213804145 is an apocalyptic number.

It is an amenable number.

213804145 is a deficient number, since it is larger than the sum of its proper divisors (42902711).

213804145 is a wasteful number, since it uses less digits than its factorization.

213804145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23651.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 213804145 is about 14622.0431198927. The cubic root of 213804145 is about 597.9598719172.

The spelling of 213804145 in words is "two hundred thirteen million, eight hundred four thousand, one hundred forty-five".