129896477 has 2 divisors, whose sum is σ = 129896478. Its totient is φ = 129896476.

The previous prime is 129896449. The next prime is 129896491. The reversal of 129896477 is 774698921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99580441 + 30316036 = 9979^2 + 5506^2 .

It is a cyclic number.

It is not a de Polignac number, because 129896477 - 2¹² = 129892381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129896447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64948238 + 64948239.

It is an arithmetic number, because the mean of its divisors is an integer number (64948239).

Almost surely, 2^129896477 is an apocalyptic number.

It is an amenable number.

129896477 is a deficient number, since it is larger than the sum of its proper divisors (1).

129896477 is an equidigital number, since it uses as much as digits as its factorization.

129896477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 129896477 is about 11397.2135629723. The cubic root of 129896477 is about 506.4451978660.

The spelling of 129896477 in words is "one hundred twenty-nine million, eight hundred ninety-six thousand, four hundred seventy-seven".