91983005 has 8 divisors (see below), whose sum is σ = 116872632. Its totient is φ = 69257728.

The previous prime is 91982963. The next prime is 91983011. The reversal of 91983005 is 50038919.

It can be written as a sum of positive squares in 4 ways, for example, as 21187609 + 70795396 = 4603^2 + 8414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91983005 - 2⁸ = 91982749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540992 + ... + 541161.

It is an arithmetic number, because the mean of its divisors is an integer number (14609079).

Almost surely, 2^91983005 is an apocalyptic number.

It is an amenable number.

91983005 is a deficient number, since it is larger than the sum of its proper divisors (24889627).

91983005 is a wasteful number, since it uses less digits than its factorization.

91983005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082175.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 91983005 is about 9590.7770800911. Note that the first 3 decimals coincide. The cubic root of 91983005 is about 451.4079441890.

The spelling of 91983005 in words is "ninety-one million, nine hundred eighty-three thousand, five".