129782297 has 4 divisors (see below), whose sum is σ = 129813540. Its totient is φ = 129751056.

The previous prime is 129782287. The next prime is 129782309. The reversal of 129782297 is 792287921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 792287921 = 9901 ⋅80021.

It can be written as a sum of positive squares in 2 ways, for example, as 23609881 + 106172416 = 4859^2 + 10304^2 .

It is a cyclic number.

It is not a de Polignac number, because 129782297 - 2¹⁰ = 129781273 is a prime.

It is a super-2 number, since 2×129782297² = 33686889229192418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129782287) 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, 8222 + ... + 18087.

It is an arithmetic number, because the mean of its divisors is an integer number (32453385).

Almost surely, 2^129782297 is an apocalyptic number.

It is an amenable number.

129782297 is a deficient number, since it is larger than the sum of its proper divisors (31243).

129782297 is an equidigital number, since it uses as much as digits as its factorization.

129782297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31242.

The product of its digits is 254016, while the sum is 47.

The square root of 129782297 is about 11392.2033426375. The cubic root of 129782297 is about 506.2967646278.

The spelling of 129782297 in words is "one hundred twenty-nine million, seven hundred eighty-two thousand, two hundred ninety-seven".