213439081 has 4 divisors (see below), whose sum is σ = 213896592. Its totient is φ = 212981572.

The previous prime is 213439069. The next prime is 213439111. The reversal of 213439081 is 180934312.

213439081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213439081 - 2¹⁵ = 213406313 is a prime.

It is a super-2 number, since 2×213439081² = 91112482596249122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213439021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228055 + ... + 228988.

It is an arithmetic number, because the mean of its divisors is an integer number (53474148).

Almost surely, 2^213439081 is an apocalyptic number.

It is an amenable number.

213439081 is a deficient number, since it is larger than the sum of its proper divisors (457511).

213439081 is an equidigital number, since it uses as much as digits as its factorization.

213439081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457510.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 213439081 is about 14609.5544422135. The cubic root of 213439081 is about 597.6193453356.

The spelling of 213439081 in words is "two hundred thirteen million, four hundred thirty-nine thousand, eighty-one".