9539981 has 4 divisors (see below), whose sum is σ = 10407264. Its totient is φ = 8672700.

The previous prime is 9539977. The next prime is 9539983. The reversal of 9539981 is 1899359.

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 9539981 - 2² = 9539977 is a prime.

It is a super-2 number, since 2×9539981² = 182022474960722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9539983) 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, 433625 + ... + 433646.

It is an arithmetic number, because the mean of its divisors is an integer number (2601816).

Almost surely, 2^9539981 is an apocalyptic number.

It is an amenable number.

9539981 is a deficient number, since it is larger than the sum of its proper divisors (867283).

9539981 is a wasteful number, since it uses less digits than its factorization.

9539981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867282.

The product of its digits is 87480, while the sum is 44.

The square root of 9539981 is about 3088.6859665560. The cubic root of 9539981 is about 212.0878729704.

The spelling of 9539981 in words is "nine million, five hundred thirty-nine thousand, nine hundred eighty-one".