1231131127 has 2 divisors, whose sum is σ = 1231131128. Its totient is φ = 1231131126.

The previous prime is 1231131119. The next prime is 1231131137. The reversal of 1231131127 is 7211311321.

It is a weak prime.

It is an emirp because it is prime and its reverse (7211311321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231131127 - 2³ = 1231131119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231131098 and 1231131107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231131107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615565563 + 615565564.

It is an arithmetic number, because the mean of its divisors is an integer number (615565564).

Almost surely, 2^1231131127 is an apocalyptic number.

1231131127 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231131127 is an equidigital number, since it uses as much as digits as its factorization.

1231131127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 22.

The square root of 1231131127 is about 35087.4782080445. The cubic root of 1231131127 is about 1071.7696070441.

Adding to 1231131127 its reverse (7211311321), we get a palindrome (8442442448).

The spelling of 1231131127 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, one hundred twenty-seven".