155531132 has 6 divisors (see below), whose sum is σ = 272179488. Its totient is φ = 77765564.

The previous prime is 155531111. The next prime is 155531137. The reversal of 155531132 is 231135551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155531137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19441388 + ... + 19441395.

It is an arithmetic number, because the mean of its divisors is an integer number (45363248).

Almost surely, 2^155531132 is an apocalyptic number.

It is an amenable number.

155531132 is a deficient number, since it is larger than the sum of its proper divisors (116648356).

155531132 is a wasteful number, since it uses less digits than its factorization.

155531132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38882787 (or 38882785 counting only the distinct ones).

The product of its digits is 2250, while the sum is 26.

The square root of 155531132 is about 12471.2121303424. The cubic root of 155531132 is about 537.7814002986.

Adding to 155531132 its reverse (231135551), we get a palindrome (386666683).

The spelling of 155531132 in words is "one hundred fifty-five million, five hundred thirty-one thousand, one hundred thirty-two".