1031320987 has 4 divisors (see below), whose sum is σ = 1055305240. Its totient is φ = 1007336736.

The previous prime is 1031320967. The next prime is 1031320991. The reversal of 1031320987 is 7890231301.

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 1031320987 - 2¹⁹ = 1030796699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1031320907) 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 3 ways as a sum of consecutive naturals, for example, 11992062 + ... + 11992147.

It is an arithmetic number, because the mean of its divisors is an integer number (263826310).

Almost surely, 2^1031320987 is an apocalyptic number.

1031320987 is a deficient number, since it is larger than the sum of its proper divisors (23984253).

1031320987 is an equidigital number, since it uses as much as digits as its factorization.

1031320987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23984252.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1031320987 is about 32114.1866937340. The cubic root of 1031320987 is about 1010.3331864827. Note that the first 3 decimals are identical.

The spelling of 1031320987 in words is "one billion, thirty-one million, three hundred twenty thousand, nine hundred eighty-seven".