1003131987 has 24 divisors (see below), whose sum is σ = 1583251152. Its totient is φ = 561190080.

The previous prime is 1003131929. The next prime is 1003131989. The reversal of 1003131987 is 7891313001.

It is not a de Polignac number, because 1003131987 - 2¹⁸ = 1002869843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003131989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101568 + ... + 111005.

It is an arithmetic number, because the mean of its divisors is an integer number (65968798).

Almost surely, 2^1003131987 is an apocalyptic number.

1003131987 is a deficient number, since it is larger than the sum of its proper divisors (580119165).

1003131987 is a wasteful number, since it uses less digits than its factorization.

1003131987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212611 (or 212600 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 1003131987 is about 31672.2589500654. The cubic root of 1003131987 is about 1001.0429076322.

Adding to 1003131987 its reverse (7891313001), we get a palindrome (8894444988).

The spelling of 1003131987 in words is "one billion, three million, one hundred thirty-one thousand, nine hundred eighty-seven".