8321487161 has 12 divisors (see below), whose sum is σ = 9015227820. Its totient is φ = 7677633600.

The previous prime is 8321487137. The next prime is 8321487191. The reversal of 8321487161 is 1617841238.

It can be written as a sum of positive squares in 6 ways, for example, as 1666190761 + 6655296400 = 40819^2 + 81580^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8321487161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8321487191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 372611 + ... + 394311.

It is an arithmetic number, because the mean of its divisors is an integer number (751268985).

Almost surely, 2^8321487161 is an apocalyptic number.

It is an amenable number.

8321487161 is a deficient number, since it is larger than the sum of its proper divisors (693740659).

8321487161 is a wasteful number, since it uses less digits than its factorization.

8321487161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23996 (or 23983 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 8321487161 is about 91222.1856841854. The cubic root of 8321487161 is about 2026.4395321105.

The spelling of 8321487161 in words is "eight billion, three hundred twenty-one million, four hundred eighty-seven thousand, one hundred sixty-one".