213430031 has 4 divisors (see below), whose sum is σ = 213476064. Its totient is φ = 213384000.

The previous prime is 213430013. The next prime is 213430037. The reversal of 213430031 is 130034312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213430031 - 2¹⁴ = 213413647 is a prime.

It is a super-2 number, since 2×213430031² = 91104756265321922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213429991 and 213430009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213430037) 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, 15170 + ... + 25631.

It is an arithmetic number, because the mean of its divisors is an integer number (53369016).

Almost surely, 2^213430031 is an apocalyptic number.

213430031 is a deficient number, since it is larger than the sum of its proper divisors (46033).

213430031 is an equidigital number, since it uses as much as digits as its factorization.

213430031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46032.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 213430031 is about 14609.2447101142. The cubic root of 213430031 is about 597.6108986921.

Adding to 213430031 its reverse (130034312), we get a palindrome (343464343).

The spelling of 213430031 in words is "two hundred thirteen million, four hundred thirty thousand, thirty-one".