154072129 has 4 divisors (see below), whose sum is σ = 154139220. Its totient is φ = 154005040.

The previous prime is 154072123. The next prime is 154072133. The reversal of 154072129 is 921270451.

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 51151104 + 102921025 = 7152^2 + 10145^2 .

It is a cyclic number.

It is not a de Polignac number, because 154072129 - 2⁵ = 154072097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 154072129.

It is not an unprimeable number, because it can be changed into a prime (154072123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29974 + ... + 34735.

It is an arithmetic number, because the mean of its divisors is an integer number (38534805).

Almost surely, 2^154072129 is an apocalyptic number.

It is an amenable number.

154072129 is a deficient number, since it is larger than the sum of its proper divisors (67091).

154072129 is an equidigital number, since it uses as much as digits as its factorization.

154072129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67090.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 154072129 is about 12412.5794660095. The cubic root of 154072129 is about 536.0945118574.

The spelling of 154072129 in words is "one hundred fifty-four million, seventy-two thousand, one hundred twenty-nine".