1242151517 has 2 divisors, whose sum is σ = 1242151518. Its totient is φ = 1242151516.

The previous prime is 1242151507. The next prime is 1242151549. The reversal of 1242151517 is 7151512421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084121476 + 158030041 = 32926^2 + 12571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242151517 - 2²⁴ = 1225374301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242151517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242151507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621075758 + 621075759.

It is an arithmetic number, because the mean of its divisors is an integer number (621075759).

Almost surely, 2^1242151517 is an apocalyptic number.

It is an amenable number.

1242151517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242151517 is an equidigital number, since it uses as much as digits as its factorization.

1242151517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 29.

The square root of 1242151517 is about 35244.1699717840. The cubic root of 1242151517 is about 1074.9580706920.

Adding to 1242151517 its reverse (7151512421), we get a palindrome (8393663938).

The spelling of 1242151517 in words is "one billion, two hundred forty-two million, one hundred fifty-one thousand, five hundred seventeen".