129377473 has 2 divisors, whose sum is σ = 129377474. Its totient is φ = 129377472.

The previous prime is 129377471. The next prime is 129377483. The reversal of 129377473 is 374773921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109244304 + 20133169 = 10452^2 + 4487^2 .

It is a cyclic number.

It is not a de Polignac number, because 129377473 - 2¹ = 129377471 is a prime.

Together with 129377471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129377471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64688736 + 64688737.

It is an arithmetic number, because the mean of its divisors is an integer number (64688737).

Almost surely, 2^129377473 is an apocalyptic number.

It is an amenable number.

129377473 is a deficient number, since it is larger than the sum of its proper divisors (1).

129377473 is an equidigital number, since it uses as much as digits as its factorization.

129377473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 43.

The square root of 129377473 is about 11374.4218754185. The cubic root of 129377473 is about 505.7697935261.

The spelling of 129377473 in words is "one hundred twenty-nine million, three hundred seventy-seven thousand, four hundred seventy-three".