129498857 has 2 divisors, whose sum is σ = 129498858. Its totient is φ = 129498856.

The previous prime is 129498847. The next prime is 129498883. The reversal of 129498857 is 758894921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126877696 + 2621161 = 11264^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 129498857 - 2¹⁶ = 129433321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129498799 and 129498808.

It is not a weakly prime, because it can be changed into another prime (129498847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64749428 + 64749429.

It is an arithmetic number, because the mean of its divisors is an integer number (64749429).

Almost surely, 2^129498857 is an apocalyptic number.

It is an amenable number.

129498857 is a deficient number, since it is larger than the sum of its proper divisors (1).

129498857 is an equidigital number, since it uses as much as digits as its factorization.

129498857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 129498857 is about 11379.7564560934. The cubic root of 129498857 is about 505.9279178359.

The spelling of 129498857 in words is "one hundred twenty-nine million, four hundred ninety-eight thousand, eight hundred fifty-seven".