1242888187 has 2 divisors, whose sum is σ = 1242888188. Its totient is φ = 1242888186.

The previous prime is 1242888181. The next prime is 1242888193. The reversal of 1242888187 is 7818882421.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1242888181) and next prime (1242888193).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242888187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242888187.

It is not a weakly prime, because it can be changed into another prime (1242888181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621444093 + 621444094.

It is an arithmetic number, because the mean of its divisors is an integer number (621444094).

Almost surely, 2^1242888187 is an apocalyptic number.

1242888187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242888187 is an equidigital number, since it uses as much as digits as its factorization.

1242888187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 458752, while the sum is 49.

The square root of 1242888187 is about 35254.6193710838. The cubic root of 1242888187 is about 1075.1705334651.

The spelling of 1242888187 in words is "one billion, two hundred forty-two million, eight hundred eighty-eight thousand, one hundred eighty-seven".