155400121 has 8 divisors (see below), whose sum is σ = 163436544. Its totient is φ = 147470400.

The previous prime is 155400109. The next prime is 155400139. The reversal of 155400121 is 121004551.

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 155400121 - 2¹¹ = 155398073 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (155400181) 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, 23680 + ... + 29521.

It is an arithmetic number, because the mean of its divisors is an integer number (20429568).

Almost surely, 2^155400121 is an apocalyptic number.

It is an amenable number.

155400121 is a deficient number, since it is larger than the sum of its proper divisors (8036423).

155400121 is a wasteful number, since it uses less digits than its factorization.

155400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53351.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 155400121 is about 12465.9584870157. The cubic root of 155400121 is about 537.6303585748.

Adding to 155400121 its reverse (121004551), we get a palindrome (276404672).

The spelling of 155400121 in words is "one hundred fifty-five million, four hundred thousand, one hundred twenty-one".