1312243019 has 2 divisors, whose sum is σ = 1312243020. Its totient is φ = 1312243018.

The previous prime is 1312242991. The next prime is 1312243027. The reversal of 1312243019 is 9103422131.

It is a strong prime.

It is an emirp because it is prime and its reverse (9103422131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312243019 - 2¹² = 1312238923 is a prime.

It is a super-2 number, since 2×1312243019² = 3443963481828468722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1312243319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656121509 + 656121510.

It is an arithmetic number, because the mean of its divisors is an integer number (656121510).

Almost surely, 2^1312243019 is an apocalyptic number.

1312243019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312243019 is an equidigital number, since it uses as much as digits as its factorization.

1312243019 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 1312243019 is about 36224.8950171012. The cubic root of 1312243019 is about 1094.8083229613.

The spelling of 1312243019 in words is "one billion, three hundred twelve million, two hundred forty-three thousand, nineteen".