129585481 has 2 divisors, whose sum is σ = 129585482. Its totient is φ = 129585480.

The previous prime is 129585457. The next prime is 129585497. The reversal of 129585481 is 184585921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95257600 + 34327881 = 9760^2 + 5859^2 .

It is a cyclic number.

It is not a de Polignac number, because 129585481 - 2⁷ = 129585353 is a prime.

It is a super-2 number, since 2×129585481² = 33584793772002722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129585431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64792740 + 64792741.

It is an arithmetic number, because the mean of its divisors is an integer number (64792741).

Almost surely, 2^129585481 is an apocalyptic number.

It is an amenable number.

129585481 is a deficient number, since it is larger than the sum of its proper divisors (1).

129585481 is an equidigital number, since it uses as much as digits as its factorization.

129585481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 43.

The square root of 129585481 is about 11383.5618766711. The cubic root of 129585481 is about 506.0407006375.

The spelling of 129585481 in words is "one hundred twenty-nine million, five hundred eighty-five thousand, four hundred eighty-one".