91000455550 has 12 divisors (see below), whose sum is σ = 169260847416. Its totient is φ = 36400182200.

The previous prime is 91000455523. The next prime is 91000455563. The reversal of 91000455550 is 5555400019.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 910004506 + ... + 910004605.

It is an arithmetic number, because the mean of its divisors is an integer number (14105070618).

Almost surely, 2^91000455550 is an apocalyptic number.

91000455550 is a deficient number, since it is larger than the sum of its proper divisors (78260391866).

91000455550 is a wasteful number, since it uses less digits than its factorization.

91000455550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820009123 (or 1820009118 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 34.

Adding to 91000455550 its reverse (5555400019), we get a palindrome (96555855569).

The spelling of 91000455550 in words is "ninety-one billion, four hundred fifty-five thousand, five hundred fifty".