85491327321 has 9 divisors (see below), whose sum is σ = 123488739829. Its totient is φ = 56993633436.

The previous prime is 85491327293. The next prime is 85491327323. The reversal of 85491327321 is 12372319458.

It is a happy number.

The square root of 85491327321 is 292389.

It is a perfect power (a square), and thus also a powerful number.

85491327321 is a `hidden beast` number, since 8 + 549 + 1 + 32 + 73 + 2 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-85491327321 is a prime.

It is a super-2 number, since 2×85491327321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85491327323) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 828436 + ... + 925898.

Almost surely, 2^85491327321 is an apocalyptic number.

85491327321 is the 292389-th square number.

85491327321 is the 146195-th centered octagonal number.

It is an amenable number.

85491327321 is a deficient number, since it is larger than the sum of its proper divisors (37997412508).

85491327321 is an frugal number, since it uses more digits than its factorization.

85491327321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194932 (or 97466 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 85491327321 in words is "eighty-five billion, four hundred ninety-one million, three hundred twenty-seven thousand, three hundred twenty-one".