1231115719 has 2 divisors, whose sum is σ = 1231115720. Its totient is φ = 1231115718.

The previous prime is 1231115693. The next prime is 1231115759. The reversal of 1231115719 is 9175111321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231115719 - 2¹⁷ = 1230984647 is a prime.

It is a super-2 number, since 2×1231115719² = 3031291827137773922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231115759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615557859 + 615557860.

It is an arithmetic number, because the mean of its divisors is an integer number (615557860).

Almost surely, 2^1231115719 is an apocalyptic number.

1231115719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231115719 is an equidigital number, since it uses as much as digits as its factorization.

1231115719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 31.

The square root of 1231115719 is about 35087.2586418489. The cubic root of 1231115719 is about 1071.7651358456.

The spelling of 1231115719 in words is "one billion, two hundred thirty-one million, one hundred fifteen thousand, seven hundred nineteen".