155781222 has 16 divisors (see below), whose sum is σ = 319162032. Its totient is φ = 50660480.

The previous prime is 155781221. The next prime is 155781233. The reversal of 155781222 is 222187551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155781221) 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, 316383 + ... + 316874.

It is an arithmetic number, because the mean of its divisors is an integer number (19947627).

Almost surely, 2^155781222 is an apocalyptic number.

155781222 is an abundant number, since it is smaller than the sum of its proper divisors (163380810).

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

155781222 is a wasteful number, since it uses less digits than its factorization.

155781222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633303.

The product of its digits is 11200, while the sum is 33.

The square root of 155781222 is about 12481.2347946828. The cubic root of 155781222 is about 538.0694920899.

The spelling of 155781222 in words is "one hundred fifty-five million, seven hundred eighty-one thousand, two hundred twenty-two".