1242051815 has 8 divisors (see below), whose sum is σ = 1490847120. Its totient is φ = 993384832.

The previous prime is 1242051809. The next prime is 1242051821. The reversal of 1242051815 is 5181502421.

It is an interprime number because it is at equal distance from previous prime (1242051809) and next prime (1242051821).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242051815 - 2²⁴ = 1225274599 is a prime.

It is a super-2 number, since 2×1242051815² = 3085385422289588450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 9314 + ... + 50703.

It is an arithmetic number, because the mean of its divisors is an integer number (186355890).

Almost surely, 2^1242051815 is an apocalyptic number.

1242051815 is a deficient number, since it is larger than the sum of its proper divisors (248795305).

1242051815 is an equidigital number, since it uses as much as digits as its factorization.

1242051815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64161.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 1242051815 is about 35242.7554966975. The cubic root of 1242051815 is about 1074.9293092149.

The spelling of 1242051815 in words is "one billion, two hundred forty-two million, fifty-one thousand, eight hundred fifteen".