231211630 has 16 divisors (see below), whose sum is σ = 448195104. Its totient is φ = 85370400.

The previous prime is 231211601. The next prime is 231211633. The reversal of 231211630 is 36112132.

It is a junction number, because it is equal to n+sod(n) for n = 231211598 and 231211607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211633) 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, 889146 + ... + 889405.

It is an arithmetic number, because the mean of its divisors is an integer number (28012194).

Almost surely, 2^231211630 is an apocalyptic number.

231211630 is a deficient number, since it is larger than the sum of its proper divisors (216983474).

231211630 is a wasteful number, since it uses less digits than its factorization.

231211630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778571.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 231211630 is about 15205.6446755802. The cubic root of 231211630 is about 613.7665630732.

Adding to 231211630 its reverse (36112132), we get a palindrome (267323762).

The spelling of 231211630 in words is "two hundred thirty-one million, two hundred eleven thousand, six hundred thirty".