1242155093 has 2 divisors, whose sum is σ = 1242155094. Its totient is φ = 1242155092.

The previous prime is 1242155071. The next prime is 1242155149. The reversal of 1242155093 is 3905512421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129094404 + 113060689 = 33602^2 + 10633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242155093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242155053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621077546 + 621077547.

It is an arithmetic number, because the mean of its divisors is an integer number (621077547).

Almost surely, 2^1242155093 is an apocalyptic number.

It is an amenable number.

1242155093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242155093 is an equidigital number, since it uses as much as digits as its factorization.

1242155093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1242155093 is about 35244.2207035423. The cubic root of 1242155093 is about 1074.9591022479.

The spelling of 1242155093 in words is "one billion, two hundred forty-two million, one hundred fifty-five thousand, ninety-three".