129461509 has 2 divisors, whose sum is σ = 129461510. Its totient is φ = 129461508.

The previous prime is 129461489. The next prime is 129461513. The reversal of 129461509 is 905164921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 6140484 = 11105^2 + 2478^2 .

It is a cyclic number.

It is not a de Polignac number, because 129461509 - 2¹¹ = 129459461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129461599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64730754 + 64730755.

It is an arithmetic number, because the mean of its divisors is an integer number (64730755).

Almost surely, 2^129461509 is an apocalyptic number.

It is an amenable number.

129461509 is a deficient number, since it is larger than the sum of its proper divisors (1).

129461509 is an equidigital number, since it uses as much as digits as its factorization.

129461509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 129461509 is about 11378.1153536076. The cubic root of 129461509 is about 505.8792759325.

The spelling of 129461509 in words is "one hundred twenty-nine million, four hundred sixty-one thousand, five hundred nine".