91359269821 has 4 divisors (see below), whose sum is σ = 94509589500. Its totient is φ = 88208950144.

The previous prime is 91359269779. The next prime is 91359269839. The reversal of 91359269821 is 12896295319.

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 25981893721 + 65377376100 = 161189^2 + 255690^2 .

It is not a de Polignac number, because 91359269821 - 2⁷ = 91359269693 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 (91359269861) 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, 1575159796 + ... + 1575159853.

It is an arithmetic number, because the mean of its divisors is an integer number (23627397375).

Almost surely, 2^91359269821 is an apocalyptic number.

It is an amenable number.

91359269821 is a deficient number, since it is larger than the sum of its proper divisors (3150319679).

91359269821 is a wasteful number, since it uses less digits than its factorization.

91359269821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150319678.

The product of its digits is 2099520, while the sum is 55.

The spelling of 91359269821 in words is "ninety-one billion, three hundred fifty-nine million, two hundred sixty-nine thousand, eight hundred twenty-one".