9921541 has 4 divisors (see below), whose sum is σ = 11338912. Its totient is φ = 8504172.

The previous prime is 9921529. The next prime is 9921577. The reversal of 9921541 is 1451299.

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.

It is a cyclic number.

It is not a de Polignac number, because 9921541 - 2¹⁵ = 9888773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921521) 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, 708675 + ... + 708688.

It is an arithmetic number, because the mean of its divisors is an integer number (2834728).

Almost surely, 2^9921541 is an apocalyptic number.

It is an amenable number.

9921541 is a deficient number, since it is larger than the sum of its proper divisors (1417371).

9921541 is a wasteful number, since it uses less digits than its factorization.

9921541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417370.

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

The square root of 9921541 is about 3149.8477740996. The cubic root of 9921541 is about 214.8785396528.

The spelling of 9921541 in words is "nine million, nine hundred twenty-one thousand, five hundred forty-one".