1242411851 has 2 divisors, whose sum is σ = 1242411852. Its totient is φ = 1242411850.

The previous prime is 1242411817. The next prime is 1242411869. The reversal of 1242411851 is 1581142421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242411851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242411251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621205925 + 621205926.

It is an arithmetic number, because the mean of its divisors is an integer number (621205926).

Almost surely, 2^1242411851 is an apocalyptic number.

1242411851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242411851 is an equidigital number, since it uses as much as digits as its factorization.

1242411851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 29.

The square root of 1242411851 is about 35247.8630699792. The cubic root of 1242411851 is about 1075.0331631377.

The spelling of 1242411851 in words is "one billion, two hundred forty-two million, four hundred eleven thousand, eight hundred fifty-one".