2155531122 has 64 divisors (see below), whose sum is σ = 4984012800. Its totient is φ = 689789520.

The previous prime is 2155531121. The next prime is 2155531123. The reversal of 2155531122 is 2211355512.

2155531122 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 531 + 122 = 666.

It is an interprime number because it is at equal distance from previous prime (2155531121) and next prime (2155531123).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2155531121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207529 + ... + 217667.

It is an arithmetic number, because the mean of its divisors is an integer number (77875200).

Almost surely, 2^2155531122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155531122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2492006400).

2155531122 is an abundant number, since it is smaller than the sum of its proper divisors (2828481678).

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

2155531122 is a wasteful number, since it uses less digits than its factorization.

2155531122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10308 (or 10302 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 2155531122 is about 46427.6977891431. The cubic root of 2155531122 is about 1291.7687257565.

Adding to 2155531122 its reverse (2211355512), we get a palindrome (4366886634).

The spelling of 2155531122 in words is "two billion, one hundred fifty-five million, five hundred thirty-one thousand, one hundred twenty-two".