211469931691 has 2 divisors, whose sum is σ = 211469931692. Its totient is φ = 211469931690.

The previous prime is 211469931677. The next prime is 211469931721. The reversal of 211469931691 is 196139964112.

211469931691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211469931691 is a prime.

It is a super-2 number, since 2×211469931691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211469931601) 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 as a sum of consecutive naturals, namely, 105734965845 + 105734965846.

It is an arithmetic number, because the mean of its divisors is an integer number (105734965846).

Almost surely, 2^211469931691 is an apocalyptic number.

211469931691 is a deficient number, since it is larger than the sum of its proper divisors (1).

211469931691 is an equidigital number, since it uses as much as digits as its factorization.

211469931691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 52.

The spelling of 211469931691 in words is "two hundred eleven billion, four hundred sixty-nine million, nine hundred thirty-one thousand, six hundred ninety-one".