1242131207 has 2 divisors, whose sum is σ = 1242131208. Its totient is φ = 1242131206.

The previous prime is 1242131183. The next prime is 1242131237. The reversal of 1242131207 is 7021312421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242131207 - 2¹⁸ = 1241869063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242131237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621065603 + 621065604.

It is an arithmetic number, because the mean of its divisors is an integer number (621065604).

Almost surely, 2^1242131207 is an apocalyptic number.

1242131207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242131207 is an equidigital number, since it uses as much as digits as its factorization.

1242131207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1242131207 is about 35243.8818378453. The cubic root of 1242131207 is about 1074.9522119013.

Adding to 1242131207 its reverse (7021312421), we get a palindrome (8263443628).

The spelling of 1242131207 in words is "one billion, two hundred forty-two million, one hundred thirty-one thousand, two hundred seven".