155539729 has 6 divisors (see below), whose sum is σ = 159242946. Its totient is φ = 151920720.

The previous prime is 155539721. The next prime is 155539733. The reversal of 155539729 is 927935551.

It can be written as a sum of positive squares in only one way, i.e., 89491600 + 66048129 = 9460^2 + 8127^2 .

It is not a de Polignac number, because 155539729 - 2³ = 155539721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155539721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40212 + ... + 43909.

It is an arithmetic number, because the mean of its divisors is an integer number (26540491).

Almost surely, 2^155539729 is an apocalyptic number.

It is an amenable number.

155539729 is a deficient number, since it is larger than the sum of its proper divisors (3703217).

155539729 is an frugal number, since it uses more digits than its factorization.

155539729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84207 (or 84164 counting only the distinct ones).

The product of its digits is 425250, while the sum is 46.

The square root of 155539729 is about 12471.5567993735. The cubic root of 155539729 is about 537.7913087576.

The spelling of 155539729 in words is "one hundred fifty-five million, five hundred thirty-nine thousand, seven hundred twenty-nine".