91550420329 has 3 divisors (see below), whose sum is σ = 91550722903. Its totient is φ = 91550117756.

The previous prime is 91550420281. The next prime is 91550420341. The reversal of 91550420329 is 92302405519.

The square root of 91550420329 is 302573.

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.

It can be written as a sum of positive squares in only one way, i.e., 87524264025 + 4026156304 = 295845^2 + 63452^2 .

It is not a de Polignac number, because 91550420329 - 2⁷ = 91550420201 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91550420291 and 91550420300.

It is not an unprimeable number, because it can be changed into a prime (91550420359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 151287 + ... + 453859.

Almost surely, 2^91550420329 is an apocalyptic number.

91550420329 is the 302573-rd square number.

91550420329 is the 151287-th centered octagonal number.

It is an amenable number.

91550420329 is a deficient number, since it is larger than the sum of its proper divisors (302574).

91550420329 is an frugal number, since it uses more digits than its factorization.

91550420329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605146 (or 302573 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 91550420329 in words is "ninety-one billion, five hundred fifty million, four hundred twenty thousand, three hundred twenty-nine".