129168553 has 2 divisors, whose sum is σ = 129168554. Its totient is φ = 129168552.

The previous prime is 129168511. The next prime is 129168569. The reversal of 129168553 is 355861921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79423744 + 49744809 = 8912^2 + 7053^2 .

It is an emirp because it is prime and its reverse (355861921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129168553 - 2¹⁷ = 129037481 is a prime.

It is a super-2 number, since 2×129168553² = 33369030168227618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129168653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64584276 + 64584277.

It is an arithmetic number, because the mean of its divisors is an integer number (64584277).

Almost surely, 2^129168553 is an apocalyptic number.

It is an amenable number.

129168553 is a deficient number, since it is larger than the sum of its proper divisors (1).

129168553 is an equidigital number, since it uses as much as digits as its factorization.

129168553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 40.

The square root of 129168553 is about 11365.2344014543. The cubic root of 129168553 is about 505.4974061972.

The spelling of 129168553 in words is "one hundred twenty-nine million, one hundred sixty-eight thousand, five hundred fifty-three".