129493831 has 2 divisors, whose sum is σ = 129493832. Its totient is φ = 129493830.

The previous prime is 129493801. The next prime is 129493891. The reversal of 129493831 is 138394921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129493831 - 2¹³ = 129485639 is a prime.

It is a super-2 number, since 2×129493831² = 33537304534113122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129493801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64746915 + 64746916.

It is an arithmetic number, because the mean of its divisors is an integer number (64746916).

Almost surely, 2^129493831 is an apocalyptic number.

129493831 is a deficient number, since it is larger than the sum of its proper divisors (1).

129493831 is an equidigital number, since it uses as much as digits as its factorization.

129493831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 129493831 is about 11379.5356232142. The cubic root of 129493831 is about 505.9213725359.

The spelling of 129493831 in words is "one hundred twenty-nine million, four hundred ninety-three thousand, eight hundred thirty-one".