155131212 has 24 divisors (see below), whose sum is σ = 368804016. Its totient is φ = 50734528.

The previous prime is 155131199. The next prime is 155131213. The reversal of 155131212 is 212131551.

It is not an unprimeable number, because it can be changed into a prime (155131213) 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, 121323 + ... + 122594.

It is an arithmetic number, because the mean of its divisors is an integer number (15366834).

Almost surely, 2^155131212 is an apocalyptic number.

155131212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155131212 is an abundant number, since it is smaller than the sum of its proper divisors (213672804).

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

155131212 is a wasteful number, since it uses less digits than its factorization.

155131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243977 (or 243975 counting only the distinct ones).

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

The square root of 155131212 is about 12455.1680839722. The cubic root of 155131212 is about 537.3200689969.

Adding to 155131212 its reverse (212131551), we get a palindrome (367262763).

The spelling of 155131212 in words is "one hundred fifty-five million, one hundred thirty-one thousand, two hundred twelve".