91014139421 has 4 divisors (see below), whose sum is σ = 91143974844. Its totient is φ = 90884304000.

The previous prime is 91014139357. The next prime is 91014139427. The reversal of 91014139421 is 12493141019.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65645613796 + 25368525625 = 256214^2 + 159275^2 .

It is a cyclic number.

It is not a de Polignac number, because 91014139421 - 2⁶ = 91014139357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91014139427) 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, 64916660 + ... + 64918061.

It is an arithmetic number, because the mean of its divisors is an integer number (22785993711).

Almost surely, 2^91014139421 is an apocalyptic number.

It is an amenable number.

91014139421 is a deficient number, since it is larger than the sum of its proper divisors (129835423).

91014139421 is a wasteful number, since it uses less digits than its factorization.

91014139421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129835422.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 91014139421 in words is "ninety-one billion, fourteen million, one hundred thirty-nine thousand, four hundred twenty-one".