1231131119 has 2 divisors, whose sum is σ = 1231131120. Its totient is φ = 1231131118.

The previous prime is 1231131107. The next prime is 1231131127. The reversal of 1231131119 is 9111311321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231131119 is a prime.

It is a super-2 number, since 2×1231131119² = 3031367664340384322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231131094 and 1231131103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231131169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615565559 + 615565560.

It is an arithmetic number, because the mean of its divisors is an integer number (615565560).

Almost surely, 2^1231131119 is an apocalyptic number.

1231131119 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231131119 is an equidigital number, since it uses as much as digits as its factorization.

1231131119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 23.

The square root of 1231131119 is about 35087.4780940437. The cubic root of 1231131119 is about 1071.7696047226.

The spelling of 1231131119 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, one hundred nineteen".