131331617 has 2 divisors, whose sum is σ = 131331618. Its totient is φ = 131331616.

The previous prime is 131331559. The next prime is 131331619. The reversal of 131331617 is 716133131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68541841 + 62789776 = 8279^2 + 7924^2 .

It is a cyclic number.

It is not a de Polignac number, because 131331617 - 2¹⁶ = 131266081 is a prime.

Together with 131331619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131331619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65665808 + 65665809.

It is an arithmetic number, because the mean of its divisors is an integer number (65665809).

Almost surely, 2^131331617 is an apocalyptic number.

It is an amenable number.

131331617 is a deficient number, since it is larger than the sum of its proper divisors (1).

131331617 is an equidigital number, since it uses as much as digits as its factorization.

131331617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

The square root of 131331617 is about 11460.0007417103. Note that the first 3 decimals coincide. The cubic root of 131331617 is about 508.3034965437.

Adding to 131331617 its reverse (716133131), we get a palindrome (847464748).

The spelling of 131331617 in words is "one hundred thirty-one million, three hundred thirty-one thousand, six hundred seventeen".