591432509551081 has 48 divisors (see below), whose sum is σ = 659647575408640. Its totient is φ = 529817158332000.

The previous prime is 591432509551049. The next prime is 591432509551099. The reversal of 591432509551081 is 180155905234195.

It is not a de Polignac number, because 591432509551081 - 2⁵ = 591432509551049 is a prime.

It is a super-2 number, since 2×591432509551081² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (591432509555081) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18700224790 + ... + 18700256416.

Almost surely, 2^{591432509551081} is an apocalyptic number.

It is an amenable number.

591432509551081 is a deficient number, since it is larger than the sum of its proper divisors (68215065857559).

591432509551081 is a wasteful number, since it uses less digits than its factorization.

591432509551081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39986 (or 39975 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 58.

The spelling of 591432509551081 in words is "five hundred ninety-one trillion, four hundred thirty-two billion, five hundred nine million, five hundred fifty-one thousand, eighty-one".