1201121603 has 4 divisors (see below), whose sum is σ = 1310314488. Its totient is φ = 1091928720.

The previous prime is 1201121599. The next prime is 1201121627. The reversal of 1201121603 is 3061211021.

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 1201121603 - 2² = 1201121599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201121693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54596426 + ... + 54596447.

It is an arithmetic number, because the mean of its divisors is an integer number (327578622).

Almost surely, 2^1201121603 is an apocalyptic number.

1201121603 is a deficient number, since it is larger than the sum of its proper divisors (109192885).

1201121603 is a wasteful number, since it uses less digits than its factorization.

1201121603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109192884.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1201121603 is about 34657.2013151668. The cubic root of 1201121603 is about 1062.9895441531.

Adding to 1201121603 its reverse (3061211021), we get a palindrome (4262332624).

The spelling of 1201121603 in words is "one billion, two hundred one million, one hundred twenty-one thousand, six hundred three".