211001989 has 32 divisors (see below), whose sum is σ = 245127168. Its totient is φ = 179928000.

The previous prime is 211001981. The next prime is 211002013. The reversal of 211001989 is 989100112.

It is a cyclic number.

It is not a de Polignac number, because 211001989 - 2³ = 211001981 is a prime.

It is a super-2 number, since 2×211001989² = 89043678723912242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211001989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2048512 + ... + 2048614.

It is an arithmetic number, because the mean of its divisors is an integer number (7660224).

Almost surely, 2^211001989 is an apocalyptic number.

It is an amenable number.

211001989 is a deficient number, since it is larger than the sum of its proper divisors (34125179).

211001989 is a wasteful number, since it uses less digits than its factorization.

211001989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 211001989 is about 14525.9075103761. The cubic root of 211001989 is about 595.3360519552.

The spelling of 211001989 in words is "two hundred eleven million, one thousand, nine hundred eighty-nine".