129031066 has 4 divisors (see below), whose sum is σ = 193546602. Its totient is φ = 64515532.

The previous prime is 129031061. The next prime is 129031073. The reversal of 129031066 is 660130921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660130921 = 7481 ⋅88241.

It can be written as a sum of positive squares in only one way, i.e., 117094041 + 11937025 = 10821^2 + 3455^2 .

It is not an unprimeable number, because it can be changed into a prime (129031061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32257765 + ... + 32257768.

Almost surely, 2^129031066 is an apocalyptic number.

129031066 is a deficient number, since it is larger than the sum of its proper divisors (64515536).

129031066 is an equidigital number, since it uses as much as digits as its factorization.

129031066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64515535.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 129031066 is about 11359.1842136661. The cubic root of 129031066 is about 505.3179920565.

Adding to 129031066 its reverse (660130921), we get a palindrome (789161987).

The spelling of 129031066 in words is "one hundred twenty-nine million, thirty-one thousand, sixty-six".