129284231 has 2 divisors, whose sum is σ = 129284232. Its totient is φ = 129284230.

The previous prime is 129284153. The next prime is 129284249. The reversal of 129284231 is 132482921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129284231 is a prime.

It is a super-2 number, since 2×129284231² = 33428824770522722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129284251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64642115 + 64642116.

It is an arithmetic number, because the mean of its divisors is an integer number (64642116).

Almost surely, 2^129284231 is an apocalyptic number.

129284231 is a deficient number, since it is larger than the sum of its proper divisors (1).

129284231 is an equidigital number, since it uses as much as digits as its factorization.

129284231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 129284231 is about 11370.3223788950. The cubic root of 129284231 is about 505.6482620115.

The spelling of 129284231 in words is "one hundred twenty-nine million, two hundred eighty-four thousand, two hundred thirty-one".