1543312231 has 2 divisors, whose sum is σ = 1543312232. Its totient is φ = 1543312230.

The previous prime is 1543312223. The next prime is 1543312271. The reversal of 1543312231 is 1322133451.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1543312231 - 2³ = 1543312223 is a prime.

It is a super-2 number, since 2×1543312231² = 4763625284708394722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1543312196 and 1543312205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1543312271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771656115 + 771656116.

It is an arithmetic number, because the mean of its divisors is an integer number (771656116).

Almost surely, 2^1543312231 is an apocalyptic number.

1543312231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543312231 is an equidigital number, since it uses as much as digits as its factorization.

1543312231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 1543312231 is about 39285.0128038671. The cubic root of 1543312231 is about 1155.6276720549.

Adding to 1543312231 its reverse (1322133451), we get a palindrome (2865445682).

The spelling of 1543312231 in words is "one billion, five hundred forty-three million, three hundred twelve thousand, two hundred thirty-one".