129563977 has 12 divisors (see below), whose sum is σ = 134794044. Its totient is φ = 124462080.

The previous prime is 129563971. The next prime is 129563999. The reversal of 129563977 is 779365921.

It can be written as a sum of positive squares in 6 ways, for example, as 3136441 + 126427536 = 1771^2 + 11244^2 .

It is not a de Polignac number, because 129563977 - 2³ = 129563969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129563977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129563971) 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 in 11 ways as a sum of consecutive naturals, for example, 218193 + ... + 218785.

It is an arithmetic number, because the mean of its divisors is an integer number (11232837).

Almost surely, 2^129563977 is an apocalyptic number.

It is an amenable number.

129563977 is a deficient number, since it is larger than the sum of its proper divisors (5230067).

129563977 is an frugal number, since it uses more digits than its factorization.

129563977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 707 counting only the distinct ones).

The product of its digits is 714420, while the sum is 49.

The square root of 129563977 is about 11382.6173176471. The cubic root of 129563977 is about 506.0127075292.

The spelling of 129563977 in words is "one hundred twenty-nine million, five hundred sixty-three thousand, nine hundred seventy-seven".