91475330421 has 4 divisors (see below), whose sum is σ = 121967107232. Its totient is φ = 60983553612.

The previous prime is 91475330407. The next prime is 91475330423. The reversal of 91475330421 is 12403357419.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91475330421 - 2⁶ = 91475330357 is a prime.

It is a super-2 number, since 2×91475330421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91475330421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91475330423) 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 3 ways as a sum of consecutive naturals, for example, 15245888401 + ... + 15245888406.

It is an arithmetic number, because the mean of its divisors is an integer number (30491776808).

Almost surely, 2^91475330421 is an apocalyptic number.

It is an amenable number.

91475330421 is a deficient number, since it is larger than the sum of its proper divisors (30491776811).

91475330421 is a wasteful number, since it uses less digits than its factorization.

91475330421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30491776810.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 91475330421 in words is "ninety-one billion, four hundred seventy-five million, three hundred thirty thousand, four hundred twenty-one".