987790901 has 6 divisors (see below), whose sum is σ = 1012472706. Its totient is φ = 963696800.

The previous prime is 987790879. The next prime is 987790907. The reversal of 987790901 is 109097789.

It can be written as a sum of positive squares in 3 ways, for example, as 26728900 + 961062001 = 5170^2 + 31001^2 .

It is not a de Polignac number, because 987790901 - 2¹⁰ = 987789877 is a prime.

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 987790901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987790907) 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 5 ways as a sum of consecutive naturals, for example, 292130 + ... + 295491.

It is an arithmetic number, because the mean of its divisors is an integer number (168745451).

Almost surely, 2^987790901 is an apocalyptic number.

It is an amenable number.

987790901 is a deficient number, since it is larger than the sum of its proper divisors (24681805).

987790901 is an equidigital number, since it uses as much as digits as its factorization.

987790901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587703 (or 587662 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 987790901 is about 31429.1409523073. The cubic root of 987790901 is about 995.9136246149.

The spelling of 987790901 in words is "nine hundred eighty-seven million, seven hundred ninety thousand, nine hundred one".