91000201020 has 24 divisors (see below), whose sum is σ = 254800563024. Its totient is φ = 24266720256.

The previous prime is 91000201009. The next prime is 91000201021. The reversal of 91000201020 is 2010200019.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000201021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758334949 + ... + 758335068.

It is an arithmetic number, because the mean of its divisors is an integer number (10616690126).

Almost surely, 2^91000201020 is an apocalyptic number.

It is an amenable number.

91000201020 is an abundant number, since it is smaller than the sum of its proper divisors (163800362004).

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

91000201020 is a wasteful number, since it uses less digits than its factorization.

91000201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516670029 (or 1516670027 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 91000201020 its reverse (2010200019), we get a palindrome (93010401039).

The spelling of 91000201020 in words is "ninety-one billion, two hundred one thousand, twenty".