211389497 has 16 divisors (see below), whose sum is σ = 251121600. Its totient is φ = 175775040.

The previous prime is 211389491. The next prime is 211389511. The reversal of 211389497 is 794983112.

It is a cyclic number.

It is not a de Polignac number, because 211389497 - 2¹⁶ = 211323961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211389491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11378 + ... + 23499.

It is an arithmetic number, because the mean of its divisors is an integer number (15695100).

Almost surely, 2^211389497 is an apocalyptic number.

It is an amenable number.

211389497 is a deficient number, since it is larger than the sum of its proper divisors (39732103).

211389497 is a wasteful number, since it uses less digits than its factorization.

211389497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34936.

The product of its digits is 108864, while the sum is 44.

The square root of 211389497 is about 14539.2399044792. The cubic root of 211389497 is about 595.7002766425.

The spelling of 211389497 in words is "two hundred eleven million, three hundred eighty-nine thousand, four hundred ninety-seven".