155025121 has 2 divisors, whose sum is σ = 155025122. Its totient is φ = 155025120.

The previous prime is 155025089. The next prime is 155025133. The reversal of 155025121 is 121520551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88830625 + 66194496 = 9425^2 + 8136^2 .

It is a cyclic number.

It is not a de Polignac number, because 155025121 - 2⁵ = 155025089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155025092 and 155025101.

It is not a weakly prime, because it can be changed into another prime (155025151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77512560 + 77512561.

It is an arithmetic number, because the mean of its divisors is an integer number (77512561).

Almost surely, 2^155025121 is an apocalyptic number.

It is an amenable number.

155025121 is a deficient number, since it is larger than the sum of its proper divisors (1).

155025121 is an equidigital number, since it uses as much as digits as its factorization.

155025121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 155025121 is about 12450.9084407524. The cubic root of 155025121 is about 537.1975537350.

Adding to 155025121 its reverse (121520551), we get a palindrome (276545672).

The spelling of 155025121 in words is "one hundred fifty-five million, twenty-five thousand, one hundred twenty-one".