91023071493 has 4 divisors (see below), whose sum is σ = 121364095328. Its totient is φ = 60682047660.

The previous prime is 91023071467. The next prime is 91023071497. The reversal of 91023071493 is 39417032019.

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 91023071493 - 2¹⁸ = 91022809349 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 (91023071497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15170511913 + ... + 15170511918.

It is an arithmetic number, because the mean of its divisors is an integer number (30341023832).

Almost surely, 2^91023071493 is an apocalyptic number.

It is an amenable number.

91023071493 is a deficient number, since it is larger than the sum of its proper divisors (30341023835).

91023071493 is a wasteful number, since it uses less digits than its factorization.

91023071493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30341023834.

The product of its (nonzero) digits is 40824, while the sum is 39.

The spelling of 91023071493 in words is "ninety-one billion, twenty-three million, seventy-one thousand, four hundred ninety-three".