129459997 has 4 divisors (see below), whose sum is σ = 131019840. Its totient is φ = 127900156.

The previous prime is 129459989. The next prime is 129460007. The reversal of 129459997 is 799954921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799954921 = 379 ⋅2110699.

It is a cyclic number.

It is not a de Polignac number, because 129459997 - 2³ = 129459989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129459917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779797 + ... + 779962.

It is an arithmetic number, because the mean of its divisors is an integer number (32754960).

Almost surely, 2^129459997 is an apocalyptic number.

It is an amenable number.

129459997 is a deficient number, since it is larger than the sum of its proper divisors (1559843).

129459997 is an equidigital number, since it uses as much as digits as its factorization.

129459997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559842.

The product of its digits is 1837080, while the sum is 55.

The square root of 129459997 is about 11378.0489100724. The cubic root of 129459997 is about 505.8773065120.

The spelling of 129459997 in words is "one hundred twenty-nine million, four hundred fifty-nine thousand, nine hundred ninety-seven".