91380550 has 24 divisors (see below), whose sum is σ = 172368432. Its totient is φ = 36036000.

The previous prime is 91380511. The next prime is 91380577. The reversal of 91380550 is 5508319.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9321 + ... + 16420.

It is an arithmetic number, because the mean of its divisors is an integer number (7182018).

Almost surely, 2^91380550 is an apocalyptic number.

91380550 is a deficient number, since it is larger than the sum of its proper divisors (80987882).

91380550 is a wasteful number, since it uses less digits than its factorization.

91380550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25824 (or 25819 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 91380550 is about 9559.3174442530. The cubic root of 91380550 is about 450.4202658177.

Adding to 91380550 its reverse (5508319), we get a palindrome (96888869).

The spelling of 91380550 in words is "ninety-one million, three hundred eighty thousand, five hundred fifty".