213490945 has 8 divisors (see below), whose sum is σ = 267327936. Its totient is φ = 163366896.

The previous prime is 213490939. The next prime is 213490957. The reversal of 213490945 is 549094312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213490945 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928107 + ... + 928336.

It is an arithmetic number, because the mean of its divisors is an integer number (33415992).

Almost surely, 2^213490945 is an apocalyptic number.

It is an amenable number.

213490945 is a deficient number, since it is larger than the sum of its proper divisors (53836991).

213490945 is a wasteful number, since it uses less digits than its factorization.

213490945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856471.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 213490945 is about 14611.3293371958. The cubic root of 213490945 is about 597.6677469988.

The spelling of 213490945 in words is "two hundred thirteen million, four hundred ninety thousand, nine hundred forty-five".