129781453 has 2 divisors, whose sum is σ = 129781454. Its totient is φ = 129781452.

The previous prime is 129781447. The next prime is 129781489. The reversal of 129781453 is 354187921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105308644 + 24472809 = 10262^2 + 4947^2 .

It is an emirp because it is prime and its reverse (354187921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129781453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129781403) 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 as a sum of consecutive naturals, namely, 64890726 + 64890727.

It is an arithmetic number, because the mean of its divisors is an integer number (64890727).

Almost surely, 2^129781453 is an apocalyptic number.

It is an amenable number.

129781453 is a deficient number, since it is larger than the sum of its proper divisors (1).

129781453 is an equidigital number, since it uses as much as digits as its factorization.

129781453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 129781453 is about 11392.1662996991. The cubic root of 129781453 is about 506.2956671094.

The spelling of 129781453 in words is "one hundred twenty-nine million, seven hundred eighty-one thousand, four hundred fifty-three".