91020120 has 32 divisors (see below), whose sum is σ = 273060720. Its totient is φ = 24272000.

The previous prime is 91020101. The next prime is 91020143. The reversal of 91020120 is 2102019.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 91020120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379131 + ... + 379370.

Almost surely, 2^91020120 is an apocalyptic number.

It is an amenable number.

91020120 is an abundant number, since it is smaller than the sum of its proper divisors (182040600).

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

91020120 is a wasteful number, since it uses less digits than its factorization.

91020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758515 (or 758511 counting only the distinct ones).

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

The square root of 91020120 is about 9540.4465304303. The cubic root of 91020120 is about 449.8272917484.

Adding to 91020120 its reverse (2102019), we get a palindrome (93122139).

The spelling of 91020120 in words is "ninety-one million, twenty thousand, one hundred twenty".