9961559 has 4 divisors (see below), whose sum is σ = 9969960. Its totient is φ = 9953160.

The previous prime is 9961543. The next prime is 9961573. The reversal of 9961559 is 9551699.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9961559 - 2⁴ = 9961543 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 (9961519) 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, 2057 + ... + 4914.

It is an arithmetic number, because the mean of its divisors is an integer number (2492490).

Almost surely, 2^9961559 is an apocalyptic number.

9961559 is a deficient number, since it is larger than the sum of its proper divisors (8401).

9961559 is a wasteful number, since it uses less digits than its factorization.

9961559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400.

The product of its digits is 109350, while the sum is 44.

The square root of 9961559 is about 3156.1937519740. The cubic root of 9961559 is about 215.1670524293.

The spelling of 9961559 in words is "nine million, nine hundred sixty-one thousand, five hundred fifty-nine".