131333437 has 2 divisors, whose sum is σ = 131333438. Its totient is φ = 131333436.

The previous prime is 131333413. The next prime is 131333443. The reversal of 131333437 is 734333131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65707236 + 65626201 = 8106^2 + 8101^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131333437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131333407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65666718 + 65666719.

It is an arithmetic number, because the mean of its divisors is an integer number (65666719).

Almost surely, 2^131333437 is an apocalyptic number.

It is an amenable number.

131333437 is a deficient number, since it is larger than the sum of its proper divisors (1).

131333437 is an equidigital number, since it uses as much as digits as its factorization.

131333437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 28.

The square root of 131333437 is about 11460.0801480618. The cubic root of 131333437 is about 508.3058445645.

Adding to 131333437 its reverse (734333131), we get a palindrome (865666568).

The spelling of 131333437 in words is "one hundred thirty-one million, three hundred thirty-three thousand, four hundred thirty-seven".