155546989 has 8 divisors (see below), whose sum is σ = 171598392. Its totient is φ = 140079360.

The previous prime is 155546947. The next prime is 155547019. The reversal of 155546989 is 989645551.

It can be written as a sum of positive squares in 4 ways, for example, as 3222025 + 152324964 = 1795^2 + 12342^2 .

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 155546989 - 2¹¹ = 155544941 is a prime.

It is a super-2 number, since 2×155546989² = 48389731573932242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155546689) 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, 145384 + ... + 146449.

It is an arithmetic number, because the mean of its divisors is an integer number (21449799).

Almost surely, 2^155546989 is an apocalyptic number.

It is an amenable number.

155546989 is a deficient number, since it is larger than the sum of its proper divisors (16051403).

155546989 is a wasteful number, since it uses less digits than its factorization.

155546989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291887.

The product of its digits is 1944000, while the sum is 52.

The square root of 155546989 is about 12471.8478582767. The cubic root of 155546989 is about 537.7996759749.

The spelling of 155546989 in words is "one hundred fifty-five million, five hundred forty-six thousand, nine hundred eighty-nine".