129154705 has 4 divisors (see below), whose sum is σ = 154985652. Its totient is φ = 103323760.

The previous prime is 129154681. The next prime is 129154721. The reversal of 129154705 is 507451921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36687249 + 92467456 = 6057^2 + 9616^2 .

It is not a de Polignac number, because 129154705 - 2¹¹ = 129152657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12915466 + ... + 12915475.

It is an arithmetic number, because the mean of its divisors is an integer number (38746413).

Almost surely, 2^129154705 is an apocalyptic number.

It is an amenable number.

129154705 is a deficient number, since it is larger than the sum of its proper divisors (25830947).

129154705 is an equidigital number, since it uses as much as digits as its factorization.

129154705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25830946.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 129154705 is about 11364.6251587987. The cubic root of 129154705 is about 505.4793409688.

The spelling of 129154705 in words is "one hundred twenty-nine million, one hundred fifty-four thousand, seven hundred five".