1131243263 has 2 divisors, whose sum is σ = 1131243264. Its totient is φ = 1131243262.

The previous prime is 1131243251. The next prime is 1131243277. The reversal of 1131243263 is 3623421311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1131243263 - 2⁶ = 1131243199 is a prime.

It is a super-2 number, since 2×1131243263² = 2559422640165774338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131243203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565621631 + 565621632.

It is an arithmetic number, because the mean of its divisors is an integer number (565621632).

Almost surely, 2^1131243263 is an apocalyptic number.

1131243263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131243263 is an equidigital number, since it uses as much as digits as its factorization.

1131243263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 1131243263 is about 33633.9599660819. The cubic root of 1131243263 is about 1041.9622909321.

Adding to 1131243263 its reverse (3623421311), we get a palindrome (4754664574).

The spelling of 1131243263 in words is "one billion, one hundred thirty-one million, two hundred forty-three thousand, two hundred sixty-three".