1001055603 has 8 divisors (see below), whose sum is σ = 1404990400. Its totient is φ = 632245608.

The previous prime is 1001055599. The next prime is 1001055607. The reversal of 1001055603 is 3065501001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1001055599) and next prime (1001055607).

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

It is not a de Polignac number, because 1001055603 - 2² = 1001055599 is a prime.

It is a super-2 number, since 2×1001055603² = 2004224640595387218, which contains 22 as substring.

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 1001055603.

It is not an unprimeable number, because it can be changed into a prime (1001055607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8781133 + ... + 8781246.

It is an arithmetic number, because the mean of its divisors is an integer number (175623800).

Almost surely, 2^1001055603 is an apocalyptic number.

1001055603 is a deficient number, since it is larger than the sum of its proper divisors (403934797).

1001055603 is a wasteful number, since it uses less digits than its factorization.

1001055603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17562401.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1001055603 is about 31639.4627482832. The cubic root of 1001055603 is about 1000.3517439284.

Adding to 1001055603 its reverse (3065501001), we get a palindrome (4066556604).

The spelling of 1001055603 in words is "one billion, one million, fifty-five thousand, six hundred three".