129375881 has 2 divisors, whose sum is σ = 129375882. Its totient is φ = 129375880.

The previous prime is 129375839. The next prime is 129375889. The reversal of 129375881 is 188573921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 59151481 = 8380^2 + 7691^2 .

It is a cyclic number.

It is not a de Polignac number, because 129375881 - 2⁶ = 129375817 is a prime.

It is a super-2 number, since 2×129375881² = 33476237169052322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129375889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64687940 + 64687941.

It is an arithmetic number, because the mean of its divisors is an integer number (64687941).

Almost surely, 2^129375881 is an apocalyptic number.

It is an amenable number.

129375881 is a deficient number, since it is larger than the sum of its proper divisors (1).

129375881 is an equidigital number, since it uses as much as digits as its factorization.

129375881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 44.

The square root of 129375881 is about 11374.3518936245. The cubic root of 129375881 is about 505.7677190052.

The spelling of 129375881 in words is "one hundred twenty-nine million, three hundred seventy-five thousand, eight hundred eighty-one".