125512155 has 24 divisors (see below), whose sum is σ = 218011248. Its totient is φ = 66799296.

The previous prime is 125512147. The next prime is 125512181. The reversal of 125512155 is 551215521.

It is not a de Polignac number, because 125512155 - 2³ = 125512147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20869 + ... + 26201.

It is an arithmetic number, because the mean of its divisors is an integer number (9083802).

Almost surely, 2^125512155 is an apocalyptic number.

125512155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

125512155 is a deficient number, since it is larger than the sum of its proper divisors (92499093).

125512155 is a wasteful number, since it uses less digits than its factorization.

125512155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5867 (or 5864 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 125512155 is about 11203.2207422687. The cubic root of 125512155 is about 500.6819428185.

Adding to 125512155 its reverse (551215521), we get a palindrome (676727676).

It can be divided in two parts, 12551 and 2155, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 125512155 in words is "one hundred twenty-five million, five hundred twelve thousand, one hundred fifty-five".