131811289 has 2 divisors, whose sum is σ = 131811290. Its totient is φ = 131811288.

The previous prime is 131811257. The next prime is 131811299. The reversal of 131811289 is 982118131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90402064 + 41409225 = 9508^2 + 6435^2 .

It is an emirp because it is prime and its reverse (982118131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131811289 - 2⁵ = 131811257 is a prime.

It is not a weakly prime, because it can be changed into another prime (131811299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65905644 + 65905645.

It is an arithmetic number, because the mean of its divisors is an integer number (65905645).

Almost surely, 2^131811289 is an apocalyptic number.

It is an amenable number.

131811289 is a deficient number, since it is larger than the sum of its proper divisors (1).

131811289 is an equidigital number, since it uses as much as digits as its factorization.

131811289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 34.

The square root of 131811289 is about 11480.9097636032. The cubic root of 131811289 is about 508.9215825817.

The spelling of 131811289 in words is "one hundred thirty-one million, eight hundred eleven thousand, two hundred eighty-nine".