9394457521 has 4 divisors (see below), whose sum is σ = 9405901044. Its totient is φ = 9383014000.

The previous prime is 9394457507. The next prime is 9394457539. The reversal of 9394457521 is 1257544939.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1485023296 + 7909434225 = 38536^2 + 88935^2 .

It is a cyclic number.

It is not a de Polignac number, because 9394457521 - 2⁷ = 9394457393 is a prime.

It is a super-2 number, since 2×9394457521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9394457591) 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, 5720530 + ... + 5722171.

It is an arithmetic number, because the mean of its divisors is an integer number (2351475261).

Almost surely, 2^9394457521 is an apocalyptic number.

It is an amenable number.

9394457521 is a deficient number, since it is larger than the sum of its proper divisors (11443523).

9394457521 is a wasteful number, since it uses less digits than its factorization.

9394457521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11443522.

The product of its digits is 1360800, while the sum is 49.

The square root of 9394457521 is about 96925.0097807578. The cubic root of 9394457521 is about 2110.0394204355.

The spelling of 9394457521 in words is "nine billion, three hundred ninety-four million, four hundred fifty-seven thousand, five hundred twenty-one".