9961603 has 4 divisors (see below), whose sum is σ = 10173600. Its totient is φ = 9749608.

The previous prime is 9961583. The next prime is 9961607. The reversal of 9961603 is 3061699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061699 = 67 ⋅45697.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9961603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9961607) 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, 105928 + ... + 106021.

It is an arithmetic number, because the mean of its divisors is an integer number (2543400).

Almost surely, 2^9961603 is an apocalyptic number.

9961603 is a deficient number, since it is larger than the sum of its proper divisors (211997).

9961603 is a wasteful number, since it uses less digits than its factorization.

9961603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211996.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 9961603 is about 3156.2007223876. The cubic root of 9961603 is about 215.1673692250.

The spelling of 9961603 in words is "nine million, nine hundred sixty-one thousand, six hundred three".