2155431102 has 64 divisors (see below), whose sum is σ = 4810613760. Its totient is φ = 638352000.

The previous prime is 2155431077. The next prime is 2155431121. The reversal of 2155431102 is 2011345512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524568 + ... + 528660.

It is an arithmetic number, because the mean of its divisors is an integer number (75165840).

Almost surely, 2^2155431102 is an apocalyptic number.

2155431102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155431102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2405306880).

2155431102 is an abundant number, since it is smaller than the sum of its proper divisors (2655182658).

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

2155431102 is a wasteful number, since it uses less digits than its factorization.

2155431102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289.

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

The square root of 2155431102 is about 46426.6206179170. The cubic root of 2155431102 is about 1291.7487454208.

Adding to 2155431102 its reverse (2011345512), we get a palindrome (4166776614).

The spelling of 2155431102 in words is "two billion, one hundred fifty-five million, four hundred thirty-one thousand, one hundred two".