1213278043 has 2 divisors, whose sum is σ = 1213278044. Its totient is φ = 1213278042.

The previous prime is 1213278023. The next prime is 1213278047. The reversal of 1213278043 is 3408723121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213278043 - 2¹⁷ = 1213146971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213277996 and 1213278014.

It is not a weakly prime, because it can be changed into another prime (1213278047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606639021 + 606639022.

It is an arithmetic number, because the mean of its divisors is an integer number (606639022).

Almost surely, 2^1213278043 is an apocalyptic number.

1213278043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213278043 is an equidigital number, since it uses as much as digits as its factorization.

1213278043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 1213278043 is about 34832.1409476937. The cubic root of 1213278043 is about 1066.5636528230.

The spelling of 1213278043 in words is "one billion, two hundred thirteen million, two hundred seventy-eight thousand, forty-three".