9955561 has 8 divisors (see below), whose sum is σ = 12412224. Its totient is φ = 7757520.

The previous prime is 9955559. The next prime is 9955567. The reversal of 9955561 is 1655599.

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

It is a cyclic number.

It is not a de Polignac number, because 9955561 - 2¹ = 9955559 is a prime.

It is a super-2 number, since 2×9955561² = 198226389649442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9955567) 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, 64570 + ... + 64723.

It is an arithmetic number, because the mean of its divisors is an integer number (1551528).

Almost surely, 2^9955561 is an apocalyptic number.

It is an amenable number.

9955561 is a deficient number, since it is larger than the sum of its proper divisors (2456663).

9955561 is a wasteful number, since it uses less digits than its factorization.

9955561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129311.

The product of its digits is 60750, while the sum is 40.

The square root of 9955561 is about 3155.2434137480. The cubic root of 9955561 is about 215.1238586852.

It can be divided in two parts, 995 and 5561, that added together give a palindrome (6556).

The spelling of 9955561 in words is "nine million, nine hundred fifty-five thousand, five hundred sixty-one".