129549797 has 4 divisors (see below), whose sum is σ = 139515180. Its totient is φ = 119584416.

The previous prime is 129549767. The next prime is 129549799. The reversal of 129549797 is 797945921.

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 69239041 + 60310756 = 8321^2 + 7766^2 .

It is a cyclic number.

It is not a de Polignac number, because 129549797 - 2¹⁰ = 129548773 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 (129549799) 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, 4982672 + ... + 4982697.

It is an arithmetic number, because the mean of its divisors is an integer number (34878795).

Almost surely, 2^129549797 is an apocalyptic number.

It is an amenable number.

129549797 is a deficient number, since it is larger than the sum of its proper divisors (9965383).

129549797 is an equidigital number, since it uses as much as digits as its factorization.

129549797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9965382.

The product of its digits is 1428840, while the sum is 53.

The square root of 129549797 is about 11381.9944210143. The cubic root of 129549797 is about 505.9942468374.

The spelling of 129549797 in words is "one hundred twenty-nine million, five hundred forty-nine thousand, seven hundred ninety-seven".