211690031 has 8 divisors (see below), whose sum is σ = 243148800. Its totient is φ = 180535608.

The previous prime is 211690027. The next prime is 211690043. The reversal of 211690031 is 130096112.

It is a happy number.

211690031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 211690031 - 2² = 211690027 is a prime.

It is a super-2 number, since 2×211690031² = 89625338449561922, 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 = 211689979 and 211690006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211690081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74591 + ... + 77376.

It is an arithmetic number, because the mean of its divisors is an integer number (30393600).

Almost surely, 2^211690031 is an apocalyptic number.

211690031 is a deficient number, since it is larger than the sum of its proper divisors (31458769).

211690031 is a wasteful number, since it uses less digits than its factorization.

211690031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152173.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 211690031 is about 14549.5715057180. The cubic root of 211690031 is about 595.9824467827.

The spelling of 211690031 in words is "two hundred eleven million, six hundred ninety thousand, thirty-one".