9955581 has 8 divisors (see below), whose sum is σ = 13362624. Its totient is φ = 6592800.

The previous prime is 9955577. The next prime is 9955633. The reversal of 9955581 is 1855599.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9955581 - 2² = 9955577 is a prime.

It is a super-2 number, since 2×9955581² = 198227186095122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9955511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10536 + ... + 11441.

It is an arithmetic number, because the mean of its divisors is an integer number (1670328).

Almost surely, 2^9955581 is an apocalyptic number.

It is an amenable number.

9955581 is a deficient number, since it is larger than the sum of its proper divisors (3407043).

9955581 is a wasteful number, since it uses less digits than its factorization.

9955581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22131.

The product of its digits is 81000, while the sum is 42.

The square root of 9955581 is about 3155.2465830740. The cubic root of 9955581 is about 215.1240027412.

The spelling of 9955581 in words is "nine million, nine hundred fifty-five thousand, five hundred eighty-one".