1242011189 has 2 divisors, whose sum is σ = 1242011190. Its totient is φ = 1242011188.

The previous prime is 1242011149. The next prime is 1242011203. The reversal of 1242011189 is 9811102421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728082289 + 513928900 = 26983^2 + 22670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242011189 - 2⁸ = 1242010933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242011149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621005594 + 621005595.

It is an arithmetic number, because the mean of its divisors is an integer number (621005595).

Almost surely, 2^1242011189 is an apocalyptic number.

It is an amenable number.

1242011189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242011189 is an equidigital number, since it uses as much as digits as its factorization.

1242011189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1242011189 is about 35242.1791182100. The cubic root of 1242011189 is about 1074.9175892116.

The spelling of 1242011189 in words is "one billion, two hundred forty-two million, eleven thousand, one hundred eighty-nine".