91001960 has 64 divisors (see below), whose sum is σ = 239742720. Its totient is φ = 30435840.

The previous prime is 91001959. The next prime is 91001993. The reversal of 91001960 is 6910019.

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, 7517 + ... + 15443.

It is an arithmetic number, because the mean of its divisors is an integer number (3745980).

Almost surely, 2^91001960 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 91001960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119871360).

91001960 is an abundant number, since it is smaller than the sum of its proper divisors (148740760).

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

91001960 is a wasteful number, since it uses less digits than its factorization.

91001960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7986 (or 7982 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 91001960 is about 9539.4947455303. The cubic root of 91001960 is about 449.7973737957.

Adding to 91001960 its reverse (6910019), we get a palindrome (97911979).

The spelling of 91001960 in words is "ninety-one million, one thousand, nine hundred sixty".