91193540 has 48 divisors (see below), whose sum is σ = 206310720. Its totient is φ = 33747840.

The previous prime is 91193533. The next prime is 91193561. The reversal of 91193540 is 4539119.

It is a junction number, because it is equal to n+sod(n) for n = 91193497 and 91193506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13550 + ... + 19130.

It is an arithmetic number, because the mean of its divisors is an integer number (4298140).

Almost surely, 2^91193540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91193540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103155360).

91193540 is an abundant number, since it is smaller than the sum of its proper divisors (115117180).

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

91193540 is a wasteful number, since it uses less digits than its factorization.

91193540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5652 (or 5650 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 91193540 is about 9549.5308785301. The cubic root of 91193540 is about 450.1127947703.

The spelling of 91193540 in words is "ninety-one million, one hundred ninety-three thousand, five hundred forty".