211431301091 has 4 divisors (see below), whose sum is σ = 212433345384. Its totient is φ = 210429256800.

The previous prime is 211431301033. The next prime is 211431301099. The reversal of 211431301091 is 190103134112.

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-211431301091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211431301091.

It is not an unprimeable number, because it can be changed into a prime (211431301099) 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, 501021830 + ... + 501022251.

It is an arithmetic number, because the mean of its divisors is an integer number (53108336346).

Almost surely, 2^211431301091 is an apocalyptic number.

211431301091 is a deficient number, since it is larger than the sum of its proper divisors (1002044293).

211431301091 is a wasteful number, since it uses less digits than its factorization.

211431301091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002044292.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 211431301091 in words is "two hundred eleven billion, four hundred thirty-one million, three hundred one thousand, ninety-one".