9400521491 has 16 divisors (see below), whose sum is σ = 10038573600. Its totient is φ = 8776988928.

The previous prime is 9400521461. The next prime is 9400521509. The reversal of 9400521491 is 1941250049.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9400521491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9400521461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3312125 + ... + 3314961.

It is an arithmetic number, because the mean of its divisors is an integer number (627410850).

Almost surely, 2^9400521491 is an apocalyptic number.

9400521491 is a deficient number, since it is larger than the sum of its proper divisors (638052109).

9400521491 is a wasteful number, since it uses less digits than its factorization.

9400521491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 9400521491 is about 96956.2864955130. The cubic root of 9400521491 is about 2110.4933215316.

The spelling of 9400521491 in words is "nine billion, four hundred million, five hundred twenty-one thousand, four hundred ninety-one".