91163536489 has 3 divisors (see below), whose sum is σ = 91163838423. Its totient is φ = 91163234556.

The previous prime is 91163536487. The next prime is 91163536493. The reversal of 91163536489 is 98463536119.

The square root of 91163536489 is 301933.

It is a perfect power (a square), and thus also a powerful number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98463536119 = 13 ⋅7574118163.

It can be written as a sum of positive squares in only one way, i.e., 27107976025 + 64055560464 = 164645^2 + 253092^2 .

It is not a de Polignac number, because 91163536489 - 2¹ = 91163536487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91163536487) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 150967 + ... + 452899.

It is an arithmetic number, because the mean of its divisors is an integer number (30387946141).

Almost surely, 2^91163536489 is an apocalyptic number.

91163536489 is the 301933-rd square number.

91163536489 is the 150967-th centered octagonal number.

It is an amenable number.

91163536489 is a deficient number, since it is larger than the sum of its proper divisors (301934).

91163536489 is an frugal number, since it uses more digits than its factorization.

91163536489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603866 (or 301933 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 55.

The spelling of 91163536489 in words is "ninety-one billion, one hundred sixty-three million, five hundred thirty-six thousand, four hundred eighty-nine".