155509943 has 8 divisors (see below), whose sum is σ = 157140000. Its totient is φ = 153888768.

The previous prime is 155509883. The next prime is 155509957. The reversal of 155509943 is 349905551.

It is a happy number.

155509943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155509943 - 2²⁰ = 154461367 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 155509943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155509993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36383 + ... + 40431.

It is an arithmetic number, because the mean of its divisors is an integer number (19642500).

Almost surely, 2^155509943 is an apocalyptic number.

155509943 is a deficient number, since it is larger than the sum of its proper divisors (1630057).

155509943 is a wasteful number, since it uses less digits than its factorization.

155509943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441.

The product of its (nonzero) digits is 121500, while the sum is 41.

The square root of 155509943 is about 12470.3625849452. The cubic root of 155509943 is about 537.7569773906.

The spelling of 155509943 in words is "one hundred fifty-five million, five hundred nine thousand, nine hundred forty-three".