231211898 has 4 divisors (see below), whose sum is σ = 346817850. Its totient is φ = 115605948.

The previous prime is 231211891. The next prime is 231211921. The reversal of 231211898 is 898112132.

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., 149255089 + 81956809 = 12217^2 + 9053^2 .

It is not an unprimeable number, because it can be changed into a prime (231211891) 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 as a sum of consecutive naturals, namely, 57802973 + ... + 57802976.

Almost surely, 2^231211898 is an apocalyptic number.

231211898 is a deficient number, since it is larger than the sum of its proper divisors (115605952).

231211898 is a wasteful number, since it uses less digits than its factorization.

231211898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115605951.

The product of its digits is 6912, while the sum is 35.

The square root of 231211898 is about 15205.6534880945. The cubic root of 231211898 is about 613.7668002143.

The spelling of 231211898 in words is "two hundred thirty-one million, two hundred eleven thousand, eight hundred ninety-eight".