91421535529 has 4 divisors (see below), whose sum is σ = 92364025684. Its totient is φ = 90479045376.

The previous prime is 91421535467. The next prime is 91421535551. The reversal of 91421535529 is 92553512419.

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 58315005225 + 33106530304 = 241485^2 + 181952^2 .

It is a cyclic number.

It is not a de Polignac number, because 91421535529 - 2¹⁵ = 91421502761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91421535559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471244932 + ... + 471245125.

It is an arithmetic number, because the mean of its divisors is an integer number (23091006421).

Almost surely, 2^91421535529 is an apocalyptic number.

It is an amenable number.

91421535529 is a deficient number, since it is larger than the sum of its proper divisors (942490155).

91421535529 is an equidigital number, since it uses as much as digits as its factorization.

91421535529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942490154.

The product of its digits is 486000, while the sum is 46.

The spelling of 91421535529 in words is "ninety-one billion, four hundred twenty-one million, five hundred thirty-five thousand, five hundred twenty-nine".