213881837 has 6 divisors (see below), whose sum is σ = 231600042. Its totient is φ = 197429232.

The previous prime is 213881831. The next prime is 213881839. The reversal of 213881837 is 738188312.

It can be written as a sum of positive squares in 3 ways, for example, as 1713481 + 212168356 = 1309^2 + 14566^2 .

It is not a de Polignac number, because 213881837 - 2⁸ = 213881581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213881794 and 213881803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213881831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 632618 + ... + 632955.

It is an arithmetic number, because the mean of its divisors is an integer number (38600007).

Almost surely, 2^213881837 is an apocalyptic number.

It is an amenable number.

213881837 is a deficient number, since it is larger than the sum of its proper divisors (17718205).

213881837 is a wasteful number, since it uses less digits than its factorization.

213881837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265599 (or 1265586 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 213881837 is about 14624.6995524694. The cubic root of 213881837 is about 598.0322918920.

The spelling of 213881837 in words is "two hundred thirteen million, eight hundred eighty-one thousand, eight hundred thirty-seven".