129847969 has 2 divisors, whose sum is σ = 129847970. Its totient is φ = 129847968.

The previous prime is 129847951. The next prime is 129847973. The reversal of 129847969 is 969748921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75898944 + 53949025 = 8712^2 + 7345^2 .

It is a cyclic number.

It is not a de Polignac number, because 129847969 - 2⁵ = 129847937 is a prime.

It is a super-3 number, since 3×129847969³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (129847979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64923984 + 64923985.

It is an arithmetic number, because the mean of its divisors is an integer number (64923985).

Almost surely, 2^129847969 is an apocalyptic number.

It is an amenable number.

129847969 is a deficient number, since it is larger than the sum of its proper divisors (1).

129847969 is an equidigital number, since it uses as much as digits as its factorization.

129847969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 129847969 is about 11395.0853002512. The cubic root of 129847969 is about 506.3821484210.

It can be divided in two parts, 129847 and 969, that added together give a triangular number (130816 = T₅₁₁).

The spelling of 129847969 in words is "one hundred twenty-nine million, eight hundred forty-seven thousand, nine hundred sixty-nine".