155981144 has 32 divisors (see below), whose sum is σ = 323436240. Its totient is φ = 69926400.

The previous prime is 155981143. The next prime is 155981149. The reversal of 155981144 is 441189551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 155981098 and 155981107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155981143) 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 7 ways as a sum of consecutive naturals, for example, 5717 + ... + 18564.

Almost surely, 2^155981144 is an apocalyptic number.

It is an amenable number.

155981144 is an abundant number, since it is smaller than the sum of its proper divisors (167455096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155981144 is a wasteful number, since it uses less digits than its factorization.

155981144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24371 (or 24367 counting only the distinct ones).

The product of its digits is 28800, while the sum is 38.

The square root of 155981144 is about 12489.2411298685. The cubic root of 155981144 is about 538.2995710491.

The spelling of 155981144 in words is "one hundred fifty-five million, nine hundred eighty-one thousand, one hundred forty-four".