211023031 has 4 divisors (see below), whose sum is σ = 211580200. Its totient is φ = 210465864.

The previous prime is 211022993. The next prime is 211023049. The reversal of 211023031 is 130320112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211023031 is a prime.

It is a super-2 number, since 2×211023031² = 89061439224853922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211023331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278016 + ... + 278773.

It is an arithmetic number, because the mean of its divisors is an integer number (52895050).

Almost surely, 2^211023031 is an apocalyptic number.

211023031 is a deficient number, since it is larger than the sum of its proper divisors (557169).

211023031 is an equidigital number, since it uses as much as digits as its factorization.

211023031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557168.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 211023031 is about 14526.6317844158. The cubic root of 211023031 is about 595.3558410970.

Adding to 211023031 its reverse (130320112), we get a palindrome (341343143).

The spelling of 211023031 in words is "two hundred eleven million, twenty-three thousand, thirty-one".