155409989 has 8 divisors (see below), whose sum is σ = 178356480. Its totient is φ = 132649776.

The previous prime is 155409977. The next prime is 155409997. The reversal of 155409989 is 989904551.

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

It is not a de Polignac number, because 155409989 - 2¹² = 155405893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155409959) 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 7 ways as a sum of consecutive naturals, for example, 44774 + ... + 48119.

It is an arithmetic number, because the mean of its divisors is an integer number (22294560).

Almost surely, 2^155409989 is an apocalyptic number.

It is an amenable number.

155409989 is a deficient number, since it is larger than the sum of its proper divisors (22946491).

155409989 is an equidigital number, since it uses as much as digits as its factorization.

155409989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93139.

The product of its (nonzero) digits is 583200, while the sum is 50.

The square root of 155409989 is about 12466.3542786173. The cubic root of 155409989 is about 537.6417382830.

The spelling of 155409989 in words is "one hundred fifty-five million, four hundred nine thousand, nine hundred eighty-nine".