129861499 has 2 divisors, whose sum is σ = 129861500. Its totient is φ = 129861498.

The previous prime is 129861491. The next prime is 129861541. The reversal of 129861499 is 994168921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129861499 - 2³ = 129861491 is a prime.

It is not a weakly prime, because it can be changed into another prime (129861491) 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, 64930749 + 64930750.

It is an arithmetic number, because the mean of its divisors is an integer number (64930750).

Almost surely, 2^129861499 is an apocalyptic number.

129861499 is a deficient number, since it is larger than the sum of its proper divisors (1).

129861499 is an equidigital number, since it uses as much as digits as its factorization.

129861499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 129861499 is about 11395.6789617820. The cubic root of 129861499 is about 506.3997359443.

The spelling of 129861499 in words is "one hundred twenty-nine million, eight hundred sixty-one thousand, four hundred ninety-nine".