213781603 has 16 divisors (see below), whose sum is σ = 249246720. Its totient is φ = 179568000.

The previous prime is 213781571. The next prime is 213781643. The reversal of 213781603 is 306187312.

213781603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 213781603 - 2⁵ = 213781571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213781643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177403 + ... + 178603.

It is an arithmetic number, because the mean of its divisors is an integer number (15577920).

Almost surely, 2^213781603 is an apocalyptic number.

213781603 is a deficient number, since it is larger than the sum of its proper divisors (35465117).

213781603 is a wasteful number, since it uses less digits than its factorization.

213781603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 213781603 is about 14621.2722770626. The cubic root of 213781603 is about 597.9388562891.

The spelling of 213781603 in words is "two hundred thirteen million, seven hundred eighty-one thousand, six hundred three".