129701897 has 4 divisors (see below), whose sum is σ = 139678980. Its totient is φ = 119724816.

The previous prime is 129701893. The next prime is 129701917. The reversal of 129701897 is 798107921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5067001 + 124634896 = 2251^2 + 11164^2 .

It is a cyclic number.

It is not a de Polignac number, because 129701897 - 2² = 129701893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129701893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4988522 + ... + 4988547.

It is an arithmetic number, because the mean of its divisors is an integer number (34919745).

Almost surely, 2^129701897 is an apocalyptic number.

It is an amenable number.

129701897 is a deficient number, since it is larger than the sum of its proper divisors (9977083).

129701897 is an equidigital number, since it uses as much as digits as its factorization.

129701897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9977082.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 129701897 is about 11388.6740668087. The cubic root of 129701897 is about 506.1921929219.

The spelling of 129701897 in words is "one hundred twenty-nine million, seven hundred one thousand, eight hundred ninety-seven".