1243420093 has 2 divisors, whose sum is σ = 1243420094. Its totient is φ = 1243420092.

The previous prime is 1243420081. The next prime is 1243420117. The reversal of 1243420093 is 3900243421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243408644 + 11449 = 35262^2 + 107^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243420093 is a prime.

It is a super-2 number, since 2×1243420093² = 3092187055352257298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243420033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621710046 + 621710047.

It is an arithmetic number, because the mean of its divisors is an integer number (621710047).

Almost surely, 2^1243420093 is an apocalyptic number.

It is an amenable number.

1243420093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243420093 is an equidigital number, since it uses as much as digits as its factorization.

1243420093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1243420093 is about 35262.1623415241. The cubic root of 1243420093 is about 1075.3238881275.

The spelling of 1243420093 in words is "one billion, two hundred forty-three million, four hundred twenty thousand, ninety-three".