1243231019 has 2 divisors, whose sum is σ = 1243231020. Its totient is φ = 1243231018.

The previous prime is 1243231013. The next prime is 1243231027. The reversal of 1243231019 is 9101323421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243231019 is a prime.

It is a super-2 number, since 2×1243231019² = 3091246733207556722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1243231013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621615509 + 621615510.

It is an arithmetic number, because the mean of its divisors is an integer number (621615510).

Almost surely, 2^1243231019 is an apocalyptic number.

1243231019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243231019 is an equidigital number, since it uses as much as digits as its factorization.

1243231019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1243231019 is about 35259.4812639097. The cubic root of 1243231019 is about 1075.2693809136.

The spelling of 1243231019 in words is "one billion, two hundred forty-three million, two hundred thirty-one thousand, nineteen".