213731082 has 16 divisors (see below), whose sum is σ = 474958080. Its totient is φ = 71243676.

The previous prime is 213731053. The next prime is 213731083. The reversal of 213731082 is 280137312.

213731082 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (213731083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1978938 + ... + 1979045.

It is an arithmetic number, because the mean of its divisors is an integer number (29684880).

Almost surely, 2^213731082 is an apocalyptic number.

213731082 is an abundant number, since it is smaller than the sum of its proper divisors (261226998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213731082 is a wasteful number, since it uses less digits than its factorization.

213731082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957994 (or 3957988 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 213731082 is about 14619.5445209487. The cubic root of 213731082 is about 597.8917508188.

Adding to 213731082 its reverse (280137312), we get a palindrome (493868394).

The spelling of 213731082 in words is "two hundred thirteen million, seven hundred thirty-one thousand, eighty-two".