91016520 has 192 divisors, whose sum is σ = 331931520. Its totient is φ = 19869696.

The previous prime is 91016507. The next prime is 91016531. The reversal of 91016520 is 2561019.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134904 + ... + 135576.

It is an arithmetic number, because the mean of its divisors is an integer number (1728810).

Almost surely, 2^91016520 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 91016520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165965760).

91016520 is an abundant number, since it is smaller than the sum of its proper divisors (240915000).

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

91016520 is a wasteful number, since it uses less digits than its factorization.

91016520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 91016520 is about 9540.2578581504. The cubic root of 91016520 is about 449.8213611930.

Adding to 91016520 its reverse (2561019), we get a palindrome (93577539).

The spelling of 91016520 in words is "ninety-one million, sixteen thousand, five hundred twenty".