131251603 has 4 divisors (see below), whose sum is σ = 150001840. Its totient is φ = 112501368.

The previous prime is 131251559. The next prime is 131251633. The reversal of 131251603 is 306152131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 306152131 = 43 ⋅7119817.

It is not a de Polignac number, because 131251603 - 2⁹ = 131251091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131251633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9375108 + ... + 9375121.

It is an arithmetic number, because the mean of its divisors is an integer number (37500460).

Almost surely, 2^131251603 is an apocalyptic number.

131251603 is a deficient number, since it is larger than the sum of its proper divisors (18750237).

131251603 is an equidigital number, since it uses as much as digits as its factorization.

131251603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18750236.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 131251603 is about 11456.5091978316. The cubic root of 131251603 is about 508.2002473303.

The spelling of 131251603 in words is "one hundred thirty-one million, two hundred fifty-one thousand, six hundred three".