129284557 has 2 divisors, whose sum is σ = 129284558. Its totient is φ = 129284556.

The previous prime is 129284513. The next prime is 129284567. The reversal of 129284557 is 755482921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89984196 + 39300361 = 9486^2 + 6269^2 .

It is a cyclic number.

It is not a de Polignac number, because 129284557 - 2⁷ = 129284429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129284567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64642278 + 64642279.

It is an arithmetic number, because the mean of its divisors is an integer number (64642279).

Almost surely, 2^129284557 is an apocalyptic number.

It is an amenable number.

129284557 is a deficient number, since it is larger than the sum of its proper divisors (1).

129284557 is an equidigital number, since it uses as much as digits as its factorization.

129284557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 129284557 is about 11370.3367144513. The cubic root of 129284557 is about 505.6486870213.

It can be divided in two parts, 1292 and 84557, that added together give a square (85849 = 293²).

The spelling of 129284557 in words is "one hundred twenty-nine million, two hundred eighty-four thousand, five hundred fifty-seven".