129085469 has 2 divisors, whose sum is σ = 129085470. Its totient is φ = 129085468.

The previous prime is 129085433. The next prime is 129085543. The reversal of 129085469 is 964580921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86025625 + 43059844 = 9275^2 + 6562^2 .

It is a cyclic number.

It is not a de Polignac number, because 129085469 - 2¹² = 129081373 is a prime.

It is a super-2 number, since 2×129085469² = 33326116613899922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129085669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64542734 + 64542735.

It is an arithmetic number, because the mean of its divisors is an integer number (64542735).

Almost surely, 2^129085469 is an apocalyptic number.

It is an amenable number.

129085469 is a deficient number, since it is larger than the sum of its proper divisors (1).

129085469 is an equidigital number, since it uses as much as digits as its factorization.

129085469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 129085469 is about 11361.5786315107. The cubic root of 129085469 is about 505.3890006719.

The spelling of 129085469 in words is "one hundred twenty-nine million, eighty-five thousand, four hundred sixty-nine".