155222 has 4 divisors (see below), whose sum is σ = 232836. Its totient is φ = 77610.

The previous prime is 155219. The next prime is 155231. The reversal of 155222 is 222551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222551 = 7 ⋅31793.

It is a self number, because there is not a number n which added to its sum of digits gives 155222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38804 + ... + 38807.

It is an arithmetic number, because the mean of its divisors is an integer number (58209).

2¹⁵⁵²²² is an apocalyptic number.

155222 is a deficient number, since it is larger than the sum of its proper divisors (77614).

155222 is an equidigital number, since it uses as much as digits as its factorization.

155222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77613.

The product of its digits is 200, while the sum is 17.

The square root of 155222 is about 393.9822331020. The cubic root of 155222 is about 53.7424867811.

Adding to 155222 its reverse (222551), we get a palindrome (377773).

The spelling of 155222 in words is "one hundred fifty-five thousand, two hundred twenty-two".