1242302989 has 2 divisors, whose sum is σ = 1242302990. Its totient is φ = 1242302988.

The previous prime is 1242302953. The next prime is 1242303001. The reversal of 1242302989 is 9892032421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1159947364 + 82355625 = 34058^2 + 9075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242302989 - 2¹⁵ = 1242270221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242302389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621151494 + 621151495.

It is an arithmetic number, because the mean of its divisors is an integer number (621151495).

Almost surely, 2^1242302989 is an apocalyptic number.

It is an amenable number.

1242302989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242302989 is an equidigital number, since it uses as much as digits as its factorization.

1242302989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1242302989 is about 35246.3188006918. The cubic root of 1242302989 is about 1075.0017635450.

The spelling of 1242302989 in words is "one billion, two hundred forty-two million, three hundred two thousand, nine hundred eighty-nine".