1001161503 has 48 divisors (see below), whose sum is σ = 1573718016. Its totient is φ = 611582400.

The previous prime is 1001161489. The next prime is 1001161507. The reversal of 1001161503 is 3051611001.

1001161503 is a `hidden beast` number, since 1 + 0 + 0 + 1 + 161 + 503 = 666.

It is not a de Polignac number, because 1001161503 - 2⁶ = 1001161439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001161507) 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 47 ways as a sum of consecutive naturals, for example, 512178 + ... + 514128.

It is an arithmetic number, because the mean of its divisors is an integer number (32785792).

Almost surely, 2^1001161503 is an apocalyptic number.

1001161503 is a deficient number, since it is larger than the sum of its proper divisors (572556513).

1001161503 is a wasteful number, since it uses less digits than its factorization.

1001161503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084 (or 2081 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1001161503 is about 31641.1362469808. The cubic root of 1001161503 is about 1000.3870178645.

Adding to 1001161503 its reverse (3051611001), we get a palindrome (4052772504).

The spelling of 1001161503 in words is "one billion, one million, one hundred sixty-one thousand, five hundred three".