129154231 has 2 divisors, whose sum is σ = 129154232. Its totient is φ = 129154230.

The previous prime is 129154217. The next prime is 129154247. The reversal of 129154231 is 132451921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129154231 - 2¹⁷ = 129023159 is a prime.

It is a super-2 number, since 2×129154231² = 33361630770402722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129154231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129154031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64577115 + 64577116.

It is an arithmetic number, because the mean of its divisors is an integer number (64577116).

Almost surely, 2^129154231 is an apocalyptic number.

129154231 is a deficient number, since it is larger than the sum of its proper divisors (1).

129154231 is an equidigital number, since it uses as much as digits as its factorization.

129154231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 129154231 is about 11364.6043045942. The cubic root of 129154231 is about 505.4787225954.

The spelling of 129154231 in words is "one hundred twenty-nine million, one hundred fifty-four thousand, two hundred thirty-one".