129467857 has 2 divisors, whose sum is σ = 129467858. Its totient is φ = 129467856.

The previous prime is 129467839. The next prime is 129467867. The reversal of 129467857 is 758764921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77281681 + 52186176 = 8791^2 + 7224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129467857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129467857.

It is not a weakly prime, because it can be changed into another prime (129467827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64733928 + 64733929.

It is an arithmetic number, because the mean of its divisors is an integer number (64733929).

Almost surely, 2^129467857 is an apocalyptic number.

It is an amenable number.

129467857 is a deficient number, since it is larger than the sum of its proper divisors (1).

129467857 is an equidigital number, since it uses as much as digits as its factorization.

129467857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 129467857 is about 11378.3943067552. The cubic root of 129467857 is about 505.8875442052.

The spelling of 129467857 in words is "one hundred twenty-nine million, four hundred sixty-seven thousand, eight hundred fifty-seven".