155211132 has 24 divisors (see below), whose sum is σ = 374648400. Its totient is φ = 49952896.

The previous prime is 155211131. The next prime is 155211143. The reversal of 155211132 is 231112551.

It is a junction number, because it is equal to n+sod(n) for n = 155211099 and 155211108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155211131) 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, 222657 + ... + 223352.

It is an arithmetic number, because the mean of its divisors is an integer number (15610350).

Almost surely, 2^155211132 is an apocalyptic number.

155211132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155211132 is an abundant number, since it is smaller than the sum of its proper divisors (219437268).

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

155211132 is a wasteful number, since it uses less digits than its factorization.

155211132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446045 (or 446043 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 155211132 is about 12458.3759776305. The cubic root of 155211132 is about 537.4123247656.

Adding to 155211132 its reverse (231112551), we get a palindrome (386323683).

It can be divided in two parts, 15521 and 1132, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 155211132 in words is "one hundred fifty-five million, two hundred eleven thousand, one hundred thirty-two".