155601222 has 32 divisors (see below), whose sum is σ = 374380800. Its totient is φ = 42117408.

The previous prime is 155601197. The next prime is 155601223. The reversal of 155601222 is 222106551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 155601192 and 155601201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155601223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96697 + ... + 98292.

It is an arithmetic number, because the mean of its divisors is an integer number (11699400).

Almost surely, 2^155601222 is an apocalyptic number.

155601222 is an abundant number, since it is smaller than the sum of its proper divisors (218779578).

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

155601222 is a wasteful number, since it uses less digits than its factorization.

155601222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195020.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 155601222 is about 12474.0218855027. The cubic root of 155601222 is about 537.8621717754.

Adding to 155601222 its reverse (222106551), we get a palindrome (377707773).

The spelling of 155601222 in words is "one hundred fifty-five million, six hundred one thousand, two hundred twenty-two".