231211240 has 32 divisors (see below), whose sum is σ = 560243880. Its totient is φ = 85370112.

The previous prime is 231211219. The next prime is 231211291. The reversal of 231211240 is 42112132.

It can be written as a sum of positive squares in 4 ways, for example, as 57972996 + 173238244 = 7614^2 + 13162^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221799 + ... + 222838.

Almost surely, 2^231211240 is an apocalyptic number.

231211240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231211240 is an abundant number, since it is smaller than the sum of its proper divisors (329032640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231211240 is a wasteful number, since it uses less digits than its factorization.

231211240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444661 (or 444657 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 231211240 is about 15205.6318513898. The cubic root of 231211240 is about 613.7662179794.

Adding to 231211240 its reverse (42112132), we get a palindrome (273323372).

The spelling of 231211240 in words is "two hundred thirty-one million, two hundred eleven thousand, two hundred forty".