1242155003 has 4 divisors (see below), whose sum is σ = 1242306960. Its totient is φ = 1242003048.

The previous prime is 1242154987. The next prime is 1242155021. The reversal of 1242155003 is 3005512421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1242155003 - 2⁴ = 1242154987 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 1242155003.

It is not an unprimeable number, because it can be changed into a prime (1242155053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62975 + ... + 80312.

It is an arithmetic number, because the mean of its divisors is an integer number (310576740).

Almost surely, 2^1242155003 is an apocalyptic number.

1242155003 is a deficient number, since it is larger than the sum of its proper divisors (151957).

1242155003 is an equidigital number, since it uses as much as digits as its factorization.

1242155003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151956.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1242155003 is about 35244.2194267372. The cubic root of 1242155003 is about 1074.9590762860.

Adding to 1242155003 its reverse (3005512421), we get a palindrome (4247667424).

The spelling of 1242155003 in words is "one billion, two hundred forty-two million, one hundred fifty-five thousand, three".