129280994 has 4 divisors (see below), whose sum is σ = 193921494. Its totient is φ = 64640496.

The previous prime is 129280993. The next prime is 129281003. The reversal of 129280994 is 499082921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499082921 = 19937 ⋅25033.

It can be written as a sum of positive squares in only one way, i.e., 97752769 + 31528225 = 9887^2 + 5615^2 .

It is not an unprimeable number, because it can be changed into a prime (129280993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320247 + ... + 32320250.

Almost surely, 2^129280994 is an apocalyptic number.

129280994 is a deficient number, since it is larger than the sum of its proper divisors (64640500).

129280994 is an equidigital number, since it uses as much as digits as its factorization.

129280994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64640499.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 129280994 is about 11370.1800337550. The cubic root of 129280994 is about 505.6440418601.

The spelling of 129280994 in words is "one hundred twenty-nine million, two hundred eighty thousand, nine hundred ninety-four".