155122000 has 120 divisors (see below), whose sum is σ = 412926696. Its totient is φ = 56320000.

The previous prime is 155121997. The next prime is 155122001. The reversal of 155122000 is 221551.

It can be written as a sum of positive squares in 4 ways, for example, as 69696 + 155052304 = 264^2 + 12452^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155122001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241680 + ... + 242320.

Almost surely, 2^155122000 is an apocalyptic number.

155122000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206463348).

155122000 is an abundant number, since it is smaller than the sum of its proper divisors (257804696).

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

155122000 is a wasteful number, since it uses less digits than its factorization.

155122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 155122000 is about 12454.7982721520. The cubic root of 155122000 is about 537.3094330748.

Adding to 155122000 its reverse (221551), we get a palindrome (155343551).

The spelling of 155122000 in words is "one hundred fifty-five million, one hundred twenty-two thousand".