91729428473 has 2 divisors, whose sum is σ = 91729428474. Its totient is φ = 91729428472.

The previous prime is 91729428457. The next prime is 91729428481. The reversal of 91729428473 is 37482492719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69932744704 + 21796683769 = 264448^2 + 147637^2 .

It is a cyclic number.

It is not a de Polignac number, because 91729428473 - 2⁴ = 91729428457 is a prime.

It is a super-2 number, since 2×91729428473² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91726428473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45864714236 + 45864714237.

It is an arithmetic number, because the mean of its divisors is an integer number (45864714237).

Almost surely, 2^91729428473 is an apocalyptic number.

It is an amenable number.

91729428473 is a deficient number, since it is larger than the sum of its proper divisors (1).

91729428473 is an equidigital number, since it uses as much as digits as its factorization.

91729428473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 56.

The spelling of 91729428473 in words is "ninety-one billion, seven hundred twenty-nine million, four hundred twenty-eight thousand, four hundred seventy-three".