213751945 has 16 divisors (see below), whose sum is σ = 282142080. Its totient is φ = 155451120.

The previous prime is 213751933. The next prime is 213751981. The reversal of 213751945 is 549157312.

213751945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213751945 - 2¹¹ = 213749897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9405 + ... + 22714.

It is an arithmetic number, because the mean of its divisors is an integer number (17633880).

Almost surely, 2^213751945 is an apocalyptic number.

It is an amenable number.

213751945 is a deficient number, since it is larger than the sum of its proper divisors (68390135).

213751945 is an equidigital number, since it uses as much as digits as its factorization.

213751945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32157 (or 32135 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 213751945 is about 14620.2580346586. The cubic root of 213751945 is about 597.9112042516.

The spelling of 213751945 in words is "two hundred thirteen million, seven hundred fifty-one thousand, nine hundred forty-five".