155841989 has 8 divisors (see below), whose sum is σ = 159882240. Its totient is φ = 151832016.

The previous prime is 155841979. The next prime is 155842003. The reversal of 155841989 is 989148551.

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 155841989 - 2¹² = 155837893 is a prime.

It is a super-2 number, since 2×155841989² = 48573451070952242, which contains 22 as substring.

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 (155841919) 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, 3047 + ... + 17915.

It is an arithmetic number, because the mean of its divisors is an integer number (19985280).

Almost surely, 2^155841989 is an apocalyptic number.

It is an amenable number.

155841989 is a deficient number, since it is larger than the sum of its proper divisors (4040251).

155841989 is a wasteful number, since it uses less digits than its factorization.

155841989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15139.

The product of its digits is 518400, while the sum is 50.

The square root of 155841989 is about 12483.6688917962. The cubic root of 155841989 is about 538.1394462172.

The spelling of 155841989 in words is "one hundred fifty-five million, eight hundred forty-one thousand, nine hundred eighty-nine".