91230120 has 48 divisors (see below), whose sum is σ = 296499060. Its totient is φ = 24327936.

The previous prime is 91230089. The next prime is 91230131. The reversal of 91230120 is 2103219.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 85266756 + 5963364 = 9234^2 + 2442^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 91230093 and 91230102.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126349 + ... + 127068.

Almost surely, 2^91230120 is an apocalyptic number.

91230120 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91230120 is an abundant number, since it is smaller than the sum of its proper divisors (205268940).

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

91230120 is a wasteful number, since it uses less digits than its factorization.

91230120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253434 (or 253427 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 91230120 is about 9551.4459638319. The cubic root of 91230120 is about 450.1729705423.

Adding to 91230120 its reverse (2103219), we get a palindrome (93333339).

The spelling of 91230120 in words is "ninety-one million, two hundred thirty thousand, one hundred twenty".