1242090943 has 2 divisors, whose sum is σ = 1242090944. Its totient is φ = 1242090942.

The previous prime is 1242090929. The next prime is 1242090947. The reversal of 1242090943 is 3490902421.

It is a strong prime.

It is an emirp because it is prime and its reverse (3490902421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242090943 - 2⁵ = 1242090911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242090899 and 1242090908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242090947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621045471 + 621045472.

It is an arithmetic number, because the mean of its divisors is an integer number (621045472).

Almost surely, 2^1242090943 is an apocalyptic number.

1242090943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242090943 is an equidigital number, since it uses as much as digits as its factorization.

1242090943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1242090943 is about 35243.3106135051. The cubic root of 1242090943 is about 1074.9405968257.

The spelling of 1242090943 in words is "one billion, two hundred forty-two million, ninety thousand, nine hundred forty-three".