91117380 has 24 divisors (see below), whose sum is σ = 255128832. Its totient is φ = 24297952.

The previous prime is 91117379. The next prime is 91117381. The reversal of 91117380 is 8371119.

It is an interprime number because it is at equal distance from previous prime (91117379) and next prime (91117381).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (91117381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759252 + ... + 759371.

It is an arithmetic number, because the mean of its divisors is an integer number (10630368).

Almost surely, 2^91117380 is an apocalyptic number.

It is an amenable number.

91117380 is an abundant number, since it is smaller than the sum of its proper divisors (164011452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91117380 is a wasteful number, since it uses less digits than its factorization.

91117380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518635 (or 1518633 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 91117380 is about 9545.5424151800. The cubic root of 91117380 is about 449.9874564405.

Adding to 91117380 its reverse (8371119), we get a palindrome (99488499).

The spelling of 91117380 in words is "ninety-one million, one hundred seventeen thousand, three hundred eighty".