155105212 has 12 divisors (see below), whose sum is σ = 287400960. Its totient is φ = 72990656.

The previous prime is 155105191. The next prime is 155105213. The reversal of 155105212 is 212501551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155105213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140412 + ... + 1140547.

It is an arithmetic number, because the mean of its divisors is an integer number (23950080).

Almost surely, 2^155105212 is an apocalyptic number.

It is an amenable number.

155105212 is a deficient number, since it is larger than the sum of its proper divisors (132295748).

155105212 is a wasteful number, since it uses less digits than its factorization.

155105212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280980 (or 2280978 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 155105212 is about 12454.1242967942. The cubic root of 155105212 is about 537.2900490283.

Adding to 155105212 its reverse (212501551), we get a palindrome (367606763).

The spelling of 155105212 in words is "one hundred fifty-five million, one hundred five thousand, two hundred twelve".