131203541 has 4 divisors (see below), whose sum is σ = 149946912. Its totient is φ = 112460172.

The previous prime is 131203537. The next prime is 131203561. The reversal of 131203541 is 145302131.

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 a cyclic number.

It is not a de Polignac number, because 131203541 - 2² = 131203537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131203561) 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, 9371675 + ... + 9371688.

It is an arithmetic number, because the mean of its divisors is an integer number (37486728).

Almost surely, 2^131203541 is an apocalyptic number.

It is an amenable number.

131203541 is a deficient number, since it is larger than the sum of its proper divisors (18743371).

131203541 is an equidigital number, since it uses as much as digits as its factorization.

131203541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18743370.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 131203541 is about 11454.4114209330. The cubic root of 131203541 is about 508.1382084632.

Adding to 131203541 its reverse (145302131), we get a palindrome (276505672).

It can be divided in two parts, 13120 and 3541, that added together give a palindrome (16661).

The spelling of 131203541 in words is "one hundred thirty-one million, two hundred three thousand, five hundred forty-one".