155340121 has 8 divisors (see below), whose sum is σ = 157358664. Its totient is φ = 153331200.

The previous prime is 155340113. The next prime is 155340167. The reversal of 155340121 is 121043551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 112254025 + 43086096 = 10595^2 + 6564^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 155340121 - 2³ = 155340113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155340092 and 155340101.

It is not an unprimeable number, because it can be changed into a prime (155340821) 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, 33475 + ... + 37831.

It is an arithmetic number, because the mean of its divisors is an integer number (19669833).

Almost surely, 2^155340121 is an apocalyptic number.

It is an amenable number.

155340121 is a deficient number, since it is larger than the sum of its proper divisors (2018543).

155340121 is a wasteful number, since it uses less digits than its factorization.

155340121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4811.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 155340121 is about 12463.5517008596. The cubic root of 155340121 is about 537.5611566253.

Adding to 155340121 its reverse (121043551), we get a palindrome (276383672).

The spelling of 155340121 in words is "one hundred fifty-five million, three hundred forty thousand, one hundred twenty-one".