91729428479 has 4 divisors (see below), whose sum is σ = 98785538376. Its totient is φ = 84673318584.

The previous prime is 91729428473. The next prime is 91729428481. The reversal of 91729428479 is 97482492719.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97482492719 = 29131 ⋅3346349.

It is a cyclic number.

It is not a de Polignac number, because 91729428479 - 2¹² = 91729424383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91729428473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3528054929 + ... + 3528054954.

It is an arithmetic number, because the mean of its divisors is an integer number (24696384594).

Almost surely, 2^91729428479 is an apocalyptic number.

91729428479 is a deficient number, since it is larger than the sum of its proper divisors (7056109897).

91729428479 is a wasteful number, since it uses less digits than its factorization.

91729428479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7056109896.

The product of its digits is 18289152, while the sum is 62.

The spelling of 91729428479 in words is "ninety-one billion, seven hundred twenty-nine million, four hundred twenty-eight thousand, four hundred seventy-nine".