1240312231 has 4 divisors (see below), whose sum is σ = 1313271792. Its totient is φ = 1167352672.

The previous prime is 1240312217. The next prime is 1240312273. The reversal of 1240312231 is 1322130421.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240312231 is a prime.

It is a super-2 number, since 2×1240312231² = 3076748860736394722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240312199 and 1240312208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240312531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36479755 + ... + 36479788.

It is an arithmetic number, because the mean of its divisors is an integer number (328317948).

Almost surely, 2^1240312231 is an apocalyptic number.

1240312231 is a deficient number, since it is larger than the sum of its proper divisors (72959561).

1240312231 is an equidigital number, since it uses as much as digits as its factorization.

1240312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72959560.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1240312231 is about 35218.0668265593. The cubic root of 1240312231 is about 1074.4272358243.

Adding to 1240312231 its reverse (1322130421), we get a palindrome (2562442652).

The spelling of 1240312231 in words is "one billion, two hundred forty million, three hundred twelve thousand, two hundred thirty-one".