1236231131 has 2 divisors, whose sum is σ = 1236231132. Its totient is φ = 1236231130.

The previous prime is 1236231127. The next prime is 1236231193. The reversal of 1236231131 is 1311326321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1236231131 - 2² = 1236231127 is a prime.

It is a super-2 number, since 2×1236231131² = 3056534818507078322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1236231097 and 1236231106.

It is not a weakly prime, because it can be changed into another prime (1236231121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618115565 + 618115566.

It is an arithmetic number, because the mean of its divisors is an integer number (618115566).

Almost surely, 2^1236231131 is an apocalyptic number.

1236231131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1236231131 is an equidigital number, since it uses as much as digits as its factorization.

1236231131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 1236231131 is about 35160.0786546333. The cubic root of 1236231131 is about 1073.2475159216.

Adding to 1236231131 its reverse (1311326321), we get a palindrome (2547557452).

The spelling of 1236231131 in words is "one billion, two hundred thirty-six million, two hundred thirty-one thousand, one hundred thirty-one".