91131427733 has 4 divisors (see below), whose sum is σ = 91132206060. Its totient is φ = 91130649408.

The previous prime is 91131427693. The next prime is 91131427759. The reversal of 91131427733 is 33772413119.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 31372202884 + 59759224849 = 177122^2 + 244457^2 .

It is a cyclic number.

It is not a de Polignac number, because 91131427733 - 2⁶ = 91131427669 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 (91131427433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173810 + ... + 460947.

It is an arithmetic number, because the mean of its divisors is an integer number (22783051515).

Almost surely, 2^91131427733 is an apocalyptic number.

It is an amenable number.

91131427733 is a deficient number, since it is larger than the sum of its proper divisors (778327).

91131427733 is a wasteful number, since it uses less digits than its factorization.

91131427733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778326.

The product of its digits is 95256, while the sum is 41.

The spelling of 91131427733 in words is "ninety-one billion, one hundred thirty-one million, four hundred twenty-seven thousand, seven hundred thirty-three".