1272121603 has 4 divisors (see below), whose sum is σ = 1272195288. Its totient is φ = 1272047920.

The previous prime is 1272121561. The next prime is 1272121619. The reversal of 1272121603 is 3061212721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1272121603 - 2⁹ = 1272121091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272127603) 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 in 3 ways as a sum of consecutive naturals, for example, 4575 + ... + 50647.

It is an arithmetic number, because the mean of its divisors is an integer number (318048822).

Almost surely, 2^1272121603 is an apocalyptic number.

1272121603 is a deficient number, since it is larger than the sum of its proper divisors (73685).

1272121603 is an equidigital number, since it uses as much as digits as its factorization.

1272121603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73684.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1272121603 is about 35666.8137489179. The cubic root of 1272121603 is about 1083.5348293814.

The spelling of 1272121603 in words is "one billion, two hundred seventy-two million, one hundred twenty-one thousand, six hundred three".