155133121 has 16 divisors (see below), whose sum is σ = 186500160. Its totient is φ = 127149120.

The previous prime is 155133101. The next prime is 155133149. The reversal of 155133121 is 121331551.

It is a cyclic number.

It is not a de Polignac number, because 155133121 - 2⁷ = 155132993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155133092 and 155133101.

It is not an unprimeable number, because it can be changed into a prime (155133101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6466 + ... + 18763.

It is an arithmetic number, because the mean of its divisors is an integer number (11656260).

Almost surely, 2^155133121 is an apocalyptic number.

155133121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155133121 is a deficient number, since it is larger than the sum of its proper divisors (31367039).

155133121 is a wasteful number, since it uses less digits than its factorization.

155133121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25296.

The product of its digits is 450, while the sum is 22.

The square root of 155133121 is about 12455.2447185914. The cubic root of 155133121 is about 537.3222730231.

Adding to 155133121 its reverse (121331551), we get a palindrome (276464672).

The spelling of 155133121 in words is "one hundred fifty-five million, one hundred thirty-three thousand, one hundred twenty-one".