91240978143 has 8 divisors (see below), whose sum is σ = 139033871488. Its totient is φ = 52137701784.

The previous prime is 91240978133. The next prime is 91240978181. The reversal of 91240978143 is 34187904219.

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

It is not a de Polignac number, because 91240978143 - 2³⁴ = 74061108959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91240978092 and 91240978101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91240978133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2172404221 + ... + 2172404262.

It is an arithmetic number, because the mean of its divisors is an integer number (17379233936).

Almost surely, 2^91240978143 is an apocalyptic number.

91240978143 is a deficient number, since it is larger than the sum of its proper divisors (47792893345).

91240978143 is a wasteful number, since it uses less digits than its factorization.

91240978143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344808493.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 91240978143 in words is "ninety-one billion, two hundred forty million, nine hundred seventy-eight thousand, one hundred forty-three".