131603603 has 4 divisors (see below), whose sum is σ = 131787360. Its totient is φ = 131419848.

The previous prime is 131603599. The next prime is 131603609. The reversal of 131603603 is 306306131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131603603 - 2² = 131603599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131603609) 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, 90800 + ... + 92237.

It is an arithmetic number, because the mean of its divisors is an integer number (32946840).

Almost surely, 2^131603603 is an apocalyptic number.

131603603 is a deficient number, since it is larger than the sum of its proper divisors (183757).

131603603 is an equidigital number, since it uses as much as digits as its factorization.

131603603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183756.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 131603603 is about 11471.8613572515. The cubic root of 131603603 is about 508.6541511403.

Adding to 131603603 its reverse (306306131), we get a palindrome (437909734).

The spelling of 131603603 in words is "one hundred thirty-one million, six hundred three thousand, six hundred three".