129249497 has 4 divisors (see below), whose sum is σ = 139191780. Its totient is φ = 119307216.

The previous prime is 129249481. The next prime is 129249503. The reversal of 129249497 is 794942921.

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 48177481 + 81072016 = 6941^2 + 9004^2 .

It is a cyclic number.

It is not a de Polignac number, because 129249497 - 2⁴ = 129249481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129249427) 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, 4971122 + ... + 4971147.

It is an arithmetic number, because the mean of its divisors is an integer number (34797945).

Almost surely, 2^129249497 is an apocalyptic number.

It is an amenable number.

129249497 is a deficient number, since it is larger than the sum of its proper divisors (9942283).

129249497 is an equidigital number, since it uses as much as digits as its factorization.

129249497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9942282.

The product of its digits is 326592, while the sum is 47.

The square root of 129249497 is about 11368.7948789658. The cubic root of 129249497 is about 505.6029748183.

The spelling of 129249497 in words is "one hundred twenty-nine million, two hundred forty-nine thousand, four hundred ninety-seven".