213100031 has 8 divisors (see below), whose sum is σ = 215646720. Its totient is φ = 210567168.

The previous prime is 213100009. The next prime is 213100061. The reversal of 213100031 is 130001312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213100031 is a prime.

It is a super-2 number, since 2×213100031² = 90823246424401922, 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 = 213099985 and 213100021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213100061) 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 7 ways as a sum of consecutive naturals, for example, 29375 + ... + 35903.

It is an arithmetic number, because the mean of its divisors is an integer number (26955840).

Almost surely, 2^213100031 is an apocalyptic number.

213100031 is a deficient number, since it is larger than the sum of its proper divisors (2546689).

213100031 is a wasteful number, since it uses less digits than its factorization.

213100031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6913.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 213100031 is about 14597.9461226571. The cubic root of 213100031 is about 597.3027363024.

Adding to 213100031 its reverse (130001312), we get a palindrome (343101343).

The spelling of 213100031 in words is "two hundred thirteen million, one hundred thousand, thirty-one".