91020554325 has 36 divisors (see below), whose sum is σ = 163059474240. Its totient is φ = 48534901920.

The previous prime is 91020554323. The next prime is 91020554347. The reversal of 91020554325 is 52345502019.

It is a happy number.

91020554325 is a `hidden beast` number, since 9 + 10 + 205 + 5 + 432 + 5 = 666.

It is not a de Polignac number, because 91020554325 - 2¹ = 91020554323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91020554325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91020554323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1215316 + ... + 1288034.

It is an arithmetic number, because the mean of its divisors is an integer number (4529429840).

Almost surely, 2^91020554325 is an apocalyptic number.

It is an amenable number.

91020554325 is a deficient number, since it is larger than the sum of its proper divisors (72038919915).

91020554325 is a wasteful number, since it uses less digits than its factorization.

91020554325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78298 (or 78290 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 91020554325 in words is "ninety-one billion, twenty million, five hundred fifty-four thousand, three hundred twenty-five".