131203661 has 8 divisors (see below), whose sum is σ = 138559680. Its totient is φ = 123985312.

The previous prime is 131203651. The next prime is 131203679. The reversal of 131203661 is 166302131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131203661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 (131203651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32456 + ... + 36273.

It is an arithmetic number, because the mean of its divisors is an integer number (17319960).

Almost surely, 2^131203661 is an apocalyptic number.

It is an amenable number.

131203661 is a deficient number, since it is larger than the sum of its proper divisors (7356019).

131203661 is an equidigital number, since it uses as much as digits as its factorization.

131203661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68835.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 131203661 is about 11454.4166590883. The cubic root of 131203661 is about 508.1383633792.

Adding to 131203661 its reverse (166302131), we get a palindrome (297505792).

The spelling of 131203661 in words is "one hundred thirty-one million, two hundred three thousand, six hundred sixty-one".