155121355 has 8 divisors (see below), whose sum is σ = 187989264. Its totient is φ = 122868000.

The previous prime is 155121347. The next prime is 155121389. The reversal of 155121355 is 553121551.

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

It is not a de Polignac number, because 155121355 - 2³ = 155121347 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153081 + ... + 154090.

It is an arithmetic number, because the mean of its divisors is an integer number (23498658).

Almost surely, 2^155121355 is an apocalyptic number.

155121355 is a deficient number, since it is larger than the sum of its proper divisors (32867909).

155121355 is a wasteful number, since it uses less digits than its factorization.

155121355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307277.

The product of its digits is 3750, while the sum is 28.

The square root of 155121355 is about 12454.7723784901. The cubic root of 155121355 is about 537.3086883597.

The spelling of 155121355 in words is "one hundred fifty-five million, one hundred twenty-one thousand, three hundred fifty-five".