131942689 has 2 divisors, whose sum is σ = 131942690. Its totient is φ = 131942688.

The previous prime is 131942687. The next prime is 131942737. The reversal of 131942689 is 986249131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123032464 + 8910225 = 11092^2 + 2985^2 .

It is a cyclic number.

It is not a de Polignac number, because 131942689 - 2¹ = 131942687 is a prime.

Together with 131942687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (131942687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65971344 + 65971345.

It is an arithmetic number, because the mean of its divisors is an integer number (65971345).

Almost surely, 2^131942689 is an apocalyptic number.

It is an amenable number.

131942689 is a deficient number, since it is larger than the sum of its proper divisors (1).

131942689 is an equidigital number, since it uses as much as digits as its factorization.

131942689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 131942689 is about 11486.6308811592. The cubic root of 131942689 is about 509.0906376187.

The spelling of 131942689 in words is "one hundred thirty-one million, nine hundred forty-two thousand, six hundred eighty-nine".