213718145 has 8 divisors (see below), whose sum is σ = 257945256. Its totient is φ = 169985536.

The previous prime is 213718133. The next prime is 213718151. The reversal of 213718145 is 541817312.

It can be written as a sum of positive squares in 4 ways, for example, as 139051264 + 74666881 = 11792^2 + 8641^2 .

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 213718145 - 2⁴ = 213718129 is a prime.

It is a Duffinian number.

It is a Curzon 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, 122672 + ... + 124401.

It is an arithmetic number, because the mean of its divisors is an integer number (32243157).

Almost surely, 2^213718145 is an apocalyptic number.

It is an amenable number.

213718145 is a deficient number, since it is larger than the sum of its proper divisors (44227111).

213718145 is a wasteful number, since it uses less digits than its factorization.

213718145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247251.

The product of its digits is 6720, while the sum is 32.

The square root of 213718145 is about 14619.1020586081. The cubic root of 213718145 is about 597.8796872456.

The spelling of 213718145 in words is "two hundred thirteen million, seven hundred eighteen thousand, one hundred forty-five".