155219012 has 24 divisors (see below), whose sum is σ = 295553496. Its totient is φ = 70898688.

The previous prime is 155219011. The next prime is 155219017. The reversal of 155219012 is 210912551.

It can be written as a sum of positive squares in 4 ways, for example, as 614656 + 154604356 = 784^2 + 12434^2 .

It is a super-2 number, since 2×155219012² = 48185883372512288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (155219011) 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, 10343 + ... + 20430.

It is an arithmetic number, because the mean of its divisors is an integer number (12314729).

Almost surely, 2^155219012 is an apocalyptic number.

It is an amenable number.

155219012 is a deficient number, since it is larger than the sum of its proper divisors (140334484).

155219012 is a wasteful number, since it uses less digits than its factorization.

155219012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30887 (or 30885 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 155219012 is about 12458.6922267146. The cubic root of 155219012 is about 537.4214193398.

It can be divided in two parts, 1552 and 19012, that multiplied together give a square (29506624 = 5432²).

The spelling of 155219012 in words is "one hundred fifty-five million, two hundred nineteen thousand, twelve".