9421561 has 4 divisors (see below), whose sum is σ = 9446800. Its totient is φ = 9396324.

The previous prime is 9421543. The next prime is 9421567. The reversal of 9421561 is 1651249.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1651249 = 101 ⋅16349.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9421561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9421567) 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, 12051 + ... + 12808.

It is an arithmetic number, because the mean of its divisors is an integer number (2361700).

Almost surely, 2^9421561 is an apocalyptic number.

It is an amenable number.

9421561 is a deficient number, since it is larger than the sum of its proper divisors (25239).

9421561 is a wasteful number, since it uses less digits than its factorization.

9421561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25238.

The product of its digits is 2160, while the sum is 28.

The square root of 9421561 is about 3069.4561407520. The cubic root of 9421561 is about 211.2066661813.

The spelling of 9421561 in words is "nine million, four hundred twenty-one thousand, five hundred sixty-one".