1242509155 has 8 divisors (see below), whose sum is σ = 1522734912. Its totient is φ = 972858048.

The previous prime is 1242509111. The next prime is 1242509167. The reversal of 1242509155 is 5519052421.

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 1242509155 - 2¹¹ = 1242507107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242509155.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2643402 + ... + 2643871.

It is an arithmetic number, because the mean of its divisors is an integer number (190341864).

Almost surely, 2^1242509155 is an apocalyptic number.

1242509155 is a deficient number, since it is larger than the sum of its proper divisors (280225757).

1242509155 is an equidigital number, since it uses as much as digits as its factorization.

1242509155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287325.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1242509155 is about 35249.2433252120. The cubic root of 1242509155 is about 1075.0612274483.

The spelling of 1242509155 in words is "one billion, two hundred forty-two million, five hundred nine thousand, one hundred fifty-five".