129781403 has 2 divisors, whose sum is σ = 129781404. Its totient is φ = 129781402.

The previous prime is 129781367. The next prime is 129781447. The reversal of 129781403 is 304187921.

It is a weak prime.

It is an emirp because it is prime and its reverse (304187921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129781403 is a prime.

It is equal to p_7366616 and since 129781403 and 7366616 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (129781453) 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, 64890701 + 64890702.

It is an arithmetic number, because the mean of its divisors is an integer number (64890702).

Almost surely, 2^129781403 is an apocalyptic number.

129781403 is a deficient number, since it is larger than the sum of its proper divisors (1).

129781403 is an equidigital number, since it uses as much as digits as its factorization.

129781403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 129781403 is about 11392.1641052085. The cubic root of 129781403 is about 506.2956020904.

The spelling of 129781403 in words is "one hundred twenty-nine million, seven hundred eighty-one thousand, four hundred three".