155212215 has 16 divisors (see below), whose sum is σ = 248523648. Its totient is φ = 82718496.

The previous prime is 155212207. The next prime is 155212217. The reversal of 155212215 is 512212551.

It is not a de Polignac number, because 155212215 - 2³ = 155212207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155212217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23244 + ... + 29166.

It is an arithmetic number, because the mean of its divisors is an integer number (15532728).

Almost surely, 2^155212215 is an apocalyptic number.

155212215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155212215 is a deficient number, since it is larger than the sum of its proper divisors (93311433).

155212215 is a wasteful number, since it uses less digits than its factorization.

155212215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7678.

The product of its digits is 1000, while the sum is 24.

The square root of 155212215 is about 12458.4194422888. The cubic root of 155212215 is about 537.4135747108.

Adding to 155212215 its reverse (512212551), we get a palindrome (667424766).

The spelling of 155212215 in words is "one hundred fifty-five million, two hundred twelve thousand, two hundred fifteen".