91271531008 has 160 divisors (see below), whose sum is σ = 210708013824. Its totient is φ = 38689308672.

The previous prime is 91271530993. The next prime is 91271531033. The reversal of 91271531008 is 80013517219.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181454085 + ... + 181454587.

Almost surely, 2^91271531008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91271531008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105354006912).

91271531008 is an abundant number, since it is smaller than the sum of its proper divisors (119436482816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91271531008 is a wasteful number, since it uses less digits than its factorization.

91271531008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 91271531008 in words is "ninety-one billion, two hundred seventy-one million, five hundred thirty-one thousand, eight".