131433661 has 4 divisors (see below), whose sum is σ = 137148192. Its totient is φ = 125719132.

The previous prime is 131433641. The next prime is 131433683. The reversal of 131433661 is 166334131.

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 131433661 - 2⁵ = 131433629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131433611) 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, 2857231 + ... + 2857276.

It is an arithmetic number, because the mean of its divisors is an integer number (34287048).

Almost surely, 2^131433661 is an apocalyptic number.

It is an amenable number.

131433661 is a deficient number, since it is larger than the sum of its proper divisors (5714531).

131433661 is an equidigital number, since it uses as much as digits as its factorization.

131433661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714530.

The product of its digits is 3888, while the sum is 28.

The square root of 131433661 is about 11464.4520584283. The cubic root of 131433661 is about 508.4351122072.

Adding to 131433661 its reverse (166334131), we get a palindrome (297767792).

The spelling of 131433661 in words is "one hundred thirty-one million, four hundred thirty-three thousand, six hundred sixty-one".