91478623983 has 8 divisors (see below), whose sum is σ = 122848992000. Its totient is φ = 60547002648.

The previous prime is 91478623883. The next prime is 91478623987. The reversal of 91478623983 is 38932687419.

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

It is not a de Polignac number, because 91478623983 - 2¹² = 91478619887 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91478623987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109686183 + ... + 109687016.

It is an arithmetic number, because the mean of its divisors is an integer number (15356124000).

Almost surely, 2^91478623983 is an apocalyptic number.

91478623983 is a deficient number, since it is larger than the sum of its proper divisors (31370368017).

91478623983 is a wasteful number, since it uses less digits than its factorization.

91478623983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219373341.

The product of its digits is 15676416, while the sum is 60.

The spelling of 91478623983 in words is "ninety-one billion, four hundred seventy-eight million, six hundred twenty-three thousand, nine hundred eighty-three".