131603601 has 4 divisors (see below), whose sum is σ = 175471472. Its totient is φ = 87735732.

The previous prime is 131603599. The next prime is 131603609. The reversal of 131603601 is 106306131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131603601 - 2¹ = 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21933931 + ... + 21933936.

It is an arithmetic number, because the mean of its divisors is an integer number (43867868).

Almost surely, 2^131603601 is an apocalyptic number.

It is an amenable number.

131603601 is a deficient number, since it is larger than the sum of its proper divisors (43867871).

131603601 is an equidigital number, since it uses as much as digits as its factorization.

131603601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43867870.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 131603601 is about 11471.8612700817. The cubic root of 131603601 is about 508.6541485636.

Adding to 131603601 its reverse (106306131), we get a palindrome (237909732).

It can be divided in two parts, 13160 and 3601, that added together give a palindrome (16761).

The spelling of 131603601 in words is "one hundred thirty-one million, six hundred three thousand, six hundred one".