1242103091 has 2 divisors, whose sum is σ = 1242103092. Its totient is φ = 1242103090.

The previous prime is 1242103021. The next prime is 1242103097. The reversal of 1242103091 is 1903012421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242103091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242103097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621051545 + 621051546.

It is an arithmetic number, because the mean of its divisors is an integer number (621051546).

Almost surely, 2^1242103091 is an apocalyptic number.

1242103091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242103091 is an equidigital number, since it uses as much as digits as its factorization.

1242103091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1242103091 is about 35243.4829578463. The cubic root of 1242103091 is about 1074.9441012217.

The spelling of 1242103091 in words is "one billion, two hundred forty-two million, one hundred three thousand, ninety-one".