9521491 has 4 divisors (see below), whose sum is σ = 10881712. Its totient is φ = 8161272.

The previous prime is 9521461. The next prime is 9521497. The reversal of 9521491 is 1941259.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9521491 - 2⁵ = 9521459 is a prime.

It is a Duffinian number.

9521491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9521497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680100 + ... + 680113.

It is an arithmetic number, because the mean of its divisors is an integer number (2720428).

Almost surely, 2^9521491 is an apocalyptic number.

9521491 is a deficient number, since it is larger than the sum of its proper divisors (1360221).

9521491 is a wasteful number, since it uses less digits than its factorization.

9521491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360220.

The product of its digits is 3240, while the sum is 31.

The square root of 9521491 is about 3085.6913325866. The cubic root of 9521491 is about 211.9507643464.

The spelling of 9521491 in words is "nine million, five hundred twenty-one thousand, four hundred ninety-one".