211491898 has 4 divisors (see below), whose sum is σ = 317237850. Its totient is φ = 105745948.

The previous prime is 211491887. The next prime is 211491919. The reversal of 211491898 is 898194112.

It is a happy number.

211491898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 150136009 + 61355889 = 12253^2 + 7833^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52872973 + ... + 52872976.

Almost surely, 2^211491898 is an apocalyptic number.

211491898 is a deficient number, since it is larger than the sum of its proper divisors (105745952).

211491898 is a wasteful number, since it uses less digits than its factorization.

211491898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105745951.

The product of its digits is 41472, while the sum is 43.

The square root of 211491898 is about 14542.7610170834. The cubic root of 211491898 is about 595.7964505421.

The spelling of 211491898 in words is "two hundred eleven million, four hundred ninety-one thousand, eight hundred ninety-eight".