91287371044 has 27 divisors (see below), whose sum is σ = 168624683451. Its totient is φ = 43235947800.

The previous prime is 91287371029. The next prime is 91287371047. The reversal of 91287371044 is 44017378219.

The square root of 91287371044 is 302138.

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

It is a super-2 number, since 2×91287371044² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91287370985 and 91287371003.

It is not an unprimeable number, because it can be changed into a prime (91287371047) 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, 11477269 + ... + 11485219.

Almost surely, 2^91287371044 is an apocalyptic number.

91287371044 is the 302138-th square number.

It is an amenable number.

91287371044 is a deficient number, since it is larger than the sum of its proper divisors (77337312407).

91287371044 is an frugal number, since it uses more digits than its factorization.

91287371044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15944 (or 7972 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 91287371044 in words is "ninety-one billion, two hundred eighty-seven million, three hundred seventy-one thousand, forty-four".