125521155 has 24 divisors (see below), whose sum is σ = 218293920. Its totient is φ = 66721920.

The previous prime is 125521141. The next prime is 125521177. The reversal of 125521155 is 551125521.

125521155 is a `hidden beast` number, since 125 + 521 + 15 + 5 = 666.

It is not a de Polignac number, because 125521155 - 2¹⁸ = 125259011 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, 9511 + ... + 18479.

It is an arithmetic number, because the mean of its divisors is an integer number (9095580).

Almost surely, 2^125521155 is an apocalyptic number.

125521155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

125521155 is a deficient number, since it is larger than the sum of its proper divisors (92772765).

125521155 is a wasteful number, since it uses less digits than its factorization.

125521155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9291 (or 9288 counting only the distinct ones).

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

The square root of 125521155 is about 11203.6224052759. The cubic root of 125521155 is about 500.6939098660.

Adding to 125521155 its reverse (551125521), we get a palindrome (676646676).

The spelling of 125521155 in words is "one hundred twenty-five million, five hundred twenty-one thousand, one hundred fifty-five".