511243231 has 4 divisors (see below), whose sum is σ = 517402872. Its totient is φ = 505083592.

The previous prime is 511243217. The next prime is 511243237. The reversal of 511243231 is 132342115.

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-511243231 is a prime.

It is a super-2 number, since 2×511243231² = 522739282486638722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511243237) 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, 3079696 + ... + 3079861.

It is an arithmetic number, because the mean of its divisors is an integer number (129350718).

Almost surely, 2^511243231 is an apocalyptic number.

511243231 is a deficient number, since it is larger than the sum of its proper divisors (6159641).

511243231 is an equidigital number, since it uses as much as digits as its factorization.

511243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6159640.

The product of its digits is 720, while the sum is 22.

The square root of 511243231 is about 22610.6884238406. The cubic root of 511243231 is about 799.6056551263.

Adding to 511243231 its reverse (132342115), we get a palindrome (643585346).

The spelling of 511243231 in words is "five hundred eleven million, two hundred forty-three thousand, two hundred thirty-one".