155112100 has 72 divisors (see below), whose sum is σ = 395474688. Its totient is φ = 52060800.

The previous prime is 155112091. The next prime is 155112107. The reversal of 155112100 is 1211551.

155112100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (155112107) 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, 8877 + ... + 19723.

It is an arithmetic number, because the mean of its divisors is an integer number (5492704).

Almost surely, 2^155112100 is an apocalyptic number.

155112100 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 155112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197737344).

155112100 is an abundant number, since it is smaller than the sum of its proper divisors (240362588).

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

155112100 is a wasteful number, since it uses less digits than its factorization.

155112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10885 (or 10878 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 155112100 is about 12454.4008286228. The cubic root of 155112100 is about 537.2980023373.

Adding to 155112100 its reverse (1211551), we get a palindrome (156323651).

It can be divided in two parts, 15 and 5112100, that added together give a palindrome (5112115).

The spelling of 155112100 in words is "one hundred fifty-five million, one hundred twelve thousand, one hundred".