131949109 has 2 divisors, whose sum is σ = 131949110. Its totient is φ = 131949108.

The previous prime is 131949089. The next prime is 131949119. The reversal of 131949109 is 901949131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90668484 + 41280625 = 9522^2 + 6425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131949109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131949119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65974554 + 65974555.

It is an arithmetic number, because the mean of its divisors is an integer number (65974555).

Almost surely, 2^131949109 is an apocalyptic number.

It is an amenable number.

131949109 is a deficient number, since it is larger than the sum of its proper divisors (1).

131949109 is an equidigital number, since it uses as much as digits as its factorization.

131949109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 131949109 is about 11486.9103330704. The cubic root of 131949109 is about 509.0988945089.

The spelling of 131949109 in words is "one hundred thirty-one million, nine hundred forty-nine thousand, one hundred nine".