91003121 has 12 divisors (see below), whose sum is σ = 100392432. Its totient is φ = 81810000.

The previous prime is 91003117. The next prime is 91003127. The reversal of 91003121 is 12130019.

It is a happy number.

It is not a de Polignac number, because 91003121 - 2² = 91003117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91003121.

It is not an unprimeable number, because it can be changed into a prime (91003127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111806 + ... + 112616.

It is an arithmetic number, because the mean of its divisors is an integer number (8366036).

Almost surely, 2^91003121 is an apocalyptic number.

It is an amenable number.

91003121 is a deficient number, since it is larger than the sum of its proper divisors (9389311).

91003121 is a wasteful number, since it uses less digits than its factorization.

91003121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 91003121 is about 9539.5555976156. Note that the first 4 decimals coincide. The cubic root of 91003121 is about 449.7992866209.

It can be divided in two parts, 9100 and 3121, that added together give a palindrome (12221).

The spelling of 91003121 in words is "ninety-one million, three thousand, one hundred twenty-one".