155221232 has 20 divisors (see below), whose sum is σ = 303503640. Its totient is φ = 76897728.

The previous prime is 155221223. The next prime is 155221267. The reversal of 155221232 is 232122551.

It is a junction number, because it is equal to n+sod(n) for n = 155221198 and 155221207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42758 + ... + 46245.

It is an arithmetic number, because the mean of its divisors is an integer number (15175182).

Almost surely, 2^155221232 is an apocalyptic number.

It is an amenable number.

155221232 is a deficient number, since it is larger than the sum of its proper divisors (148282408).

155221232 is a wasteful number, since it uses less digits than its factorization.

155221232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89120 (or 89114 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 155221232 is about 12458.7813208195. The cubic root of 155221232 is about 537.4239814612.

Adding to 155221232 its reverse (232122551), we get a palindrome (387343783).

The spelling of 155221232 in words is "one hundred fifty-five million, two hundred twenty-one thousand, two hundred thirty-two".