155049121 has 4 divisors (see below), whose sum is σ = 156471700. Its totient is φ = 153626544.

The previous prime is 155049119. The next prime is 155049131. The reversal of 155049121 is 121940551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121940551 = 59 ⋅2066789.

It can be written as a sum of positive squares in 2 ways, for example, as 56325025 + 98724096 = 7505^2 + 9936^2 .

It is a cyclic number.

It is not a de Polignac number, because 155049121 - 2¹ = 155049119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155049121.

It is not an unprimeable number, because it can be changed into a prime (155049131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711126 + ... + 711343.

It is an arithmetic number, because the mean of its divisors is an integer number (39117925).

Almost surely, 2^155049121 is an apocalyptic number.

It is an amenable number.

155049121 is a deficient number, since it is larger than the sum of its proper divisors (1422579).

155049121 is a wasteful number, since it uses less digits than its factorization.

155049121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422578.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 155049121 is about 12451.8721885506. The cubic root of 155049121 is about 537.2252741370.

Adding to 155049121 its reverse (121940551), we get a palindrome (276989672).

The spelling of 155049121 in words is "one hundred fifty-five million, forty-nine thousand, one hundred twenty-one".