91001010 has 32 divisors (see below), whose sum is σ = 222108480. Its totient is φ = 23855168.

The previous prime is 91000999. The next prime is 91001059. The reversal of 91001010 is 1010019.

It is a Curzon number.

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, 23937 + ... + 27476.

It is an arithmetic number, because the mean of its divisors is an integer number (6940890).

Almost surely, 2^91001010 is an apocalyptic number.

91001010 is an abundant number, since it is smaller than the sum of its proper divisors (131107470).

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

91001010 is a wasteful number, since it uses less digits than its factorization.

91001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51482.

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 91001010 is about 9539.4449524068. Note that the first 3 decimals coincide. The cubic root of 91001010 is about 449.7958085950.

Adding to 91001010 its reverse (1010019), we get a palindrome (92011029).

The spelling of 91001010 in words is "ninety-one million, one thousand, ten".