155305121 has 8 divisors (see below), whose sum is σ = 164398080. Its totient is φ = 146461392.

The previous prime is 155305109. The next prime is 155305123. The reversal of 155305121 is 121503551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155305121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155305123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61025 + ... + 63518.

It is an arithmetic number, because the mean of its divisors is an integer number (20549760).

Almost surely, 2^155305121 is an apocalyptic number.

It is an amenable number.

155305121 is a deficient number, since it is larger than the sum of its proper divisors (9092959).

155305121 is a wasteful number, since it uses less digits than its factorization.

155305121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124615.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 155305121 is about 12462.1475276134. The cubic root of 155305121 is about 537.5207805919.

Adding to 155305121 its reverse (121503551), we get a palindrome (276808672).

The spelling of 155305121 in words is "one hundred fifty-five million, three hundred five thousand, one hundred twenty-one".