1213142243 has 2 divisors, whose sum is σ = 1213142244. Its totient is φ = 1213142242.

The previous prime is 1213142207. The next prime is 1213142263. The reversal of 1213142243 is 3422413121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213142243 - 2¹⁶ = 1213076707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213142263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606571121 + 606571122.

It is an arithmetic number, because the mean of its divisors is an integer number (606571122).

Almost surely, 2^1213142243 is an apocalyptic number.

1213142243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213142243 is an equidigital number, since it uses as much as digits as its factorization.

1213142243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 1213142243 is about 34830.1915441187. The cubic root of 1213142243 is about 1066.5238584963.

Adding to 1213142243 its reverse (3422413121), we get a palindrome (4635555364).

The spelling of 1213142243 in words is "one billion, two hundred thirteen million, one hundred forty-two thousand, two hundred forty-three".