231403211 has 8 divisors (see below), whose sum is σ = 252618240. Its totient is φ = 210676032.

The previous prime is 231403187. The next prime is 231403213. The reversal of 231403211 is 112304132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231403211 is a prime.

It is a super-2 number, since 2×231403211² = 107094892122221042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231403211.

It is not an unprimeable number, because it can be changed into a prime (231403213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120971 + ... + 122868.

It is an arithmetic number, because the mean of its divisors is an integer number (31577280).

Almost surely, 2^231403211 is an apocalyptic number.

231403211 is a deficient number, since it is larger than the sum of its proper divisors (21215029).

231403211 is a wasteful number, since it uses less digits than its factorization.

231403211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243925.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 231403211 is about 15211.9430382841. The cubic root of 231403211 is about 613.9360377514.

Adding to 231403211 its reverse (112304132), we get a palindrome (343707343).

The spelling of 231403211 in words is "two hundred thirty-one million, four hundred three thousand, two hundred eleven".