91291468042 has 4 divisors (see below), whose sum is σ = 136937202066. Its totient is φ = 45645734020.

The previous prime is 91291468027. The next prime is 91291468043. The reversal of 91291468042 is 24086419219.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 83191288041 + 8100180001 = 288429^2 + 90001^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91291467983 and 91291468001.

It is not an unprimeable number, because it can be changed into a prime (91291468043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22822867009 + ... + 22822867012.

Almost surely, 2^91291468042 is an apocalyptic number.

91291468042 is a deficient number, since it is larger than the sum of its proper divisors (45645734024).

91291468042 is a wasteful number, since it uses less digits than its factorization.

91291468042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45645734023.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 91291468042 in words is "ninety-one billion, two hundred ninety-one million, four hundred sixty-eight thousand, forty-two".