1143215531 has 2 divisors, whose sum is σ = 1143215532. Its totient is φ = 1143215530.

The previous prime is 1143215471. The next prime is 1143215537. The reversal of 1143215531 is 1355123411.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1143215531 - 2¹⁴ = 1143199147 is a prime.

It is a super-2 number, since 2×1143215531² = 2613883500639223922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1143215531.

It is not a weakly prime, because it can be changed into another prime (1143215537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571607765 + 571607766.

It is an arithmetic number, because the mean of its divisors is an integer number (571607766).

Almost surely, 2^1143215531 is an apocalyptic number.

1143215531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143215531 is an equidigital number, since it uses as much as digits as its factorization.

1143215531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 1143215531 is about 33811.4704057661. The cubic root of 1143215531 is about 1045.6251933757.

Adding to 1143215531 its reverse (1355123411), we get a palindrome (2498338942).

The spelling of 1143215531 in words is "one billion, one hundred forty-three million, two hundred fifteen thousand, five hundred thirty-one".