129154905 has 80 divisors (see below), whose sum is σ = 257805504. Its totient is φ = 61326720.

The previous prime is 129154891. The next prime is 129154937. The reversal of 129154905 is 509451921.

It is not a de Polignac number, because 129154905 - 2⁶ = 129154841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129154905.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 235842 + ... + 236388.

Almost surely, 2^129154905 is an apocalyptic number.

129154905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129154905 is a deficient number, since it is larger than the sum of its proper divisors (128650599).

129154905 is a wasteful number, since it uses less digits than its factorization.

129154905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 129154905 is about 11364.6339580296. The cubic root of 129154905 is about 505.4796018854.

The spelling of 129154905 in words is "one hundred twenty-nine million, one hundred fifty-four thousand, nine hundred five".