65131109 has 2 divisors, whose sum is σ = 65131110. Its totient is φ = 65131108.

The previous prime is 65131081. The next prime is 65131127. The reversal of 65131109 is 90113156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55502500 + 9628609 = 7450^2 + 3103^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65131109 is a prime.

It is a super-2 number, since 2×65131109² = 8484122719139762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65131139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32565554 + 32565555.

It is an arithmetic number, because the mean of its divisors is an integer number (32565555).

Almost surely, 2^65131109 is an apocalyptic number.

It is an amenable number.

65131109 is a deficient number, since it is larger than the sum of its proper divisors (1).

65131109 is an equidigital number, since it uses as much as digits as its factorization.

65131109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 65131109 is about 8070.3846872377. The cubic root of 65131109 is about 402.3427293443.

The spelling of 65131109 in words is "sixty-five million, one hundred thirty-one thousand, one hundred nine".