155121125 has 16 divisors (see below), whose sum is σ = 193969776. Its totient is φ = 123854400.

The previous prime is 155121121. The next prime is 155121133. The reversal of 155121125 is 521121551.

It can be written as a sum of positive squares in 8 ways, for example, as 17926756 + 137194369 = 4234^2 + 11713^2 .

It is not a de Polignac number, because 155121125 - 2² = 155121121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155121125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155121121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90779 + ... + 92471.

It is an arithmetic number, because the mean of its divisors is an integer number (12123111).

Almost surely, 2^155121125 is an apocalyptic number.

It is an amenable number.

155121125 is a deficient number, since it is larger than the sum of its proper divisors (38848651).

155121125 is an equidigital number, since it uses as much as digits as its factorization.

155121125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441 (or 2431 counting only the distinct ones).

The product of its digits is 500, while the sum is 23.

The square root of 155121125 is about 12454.7631450783. The cubic root of 155121125 is about 537.3084228019.

Adding to 155121125 its reverse (521121551), we get a palindrome (676242676).

The spelling of 155121125 in words is "one hundred fifty-five million, one hundred twenty-one thousand, one hundred twenty-five".