155055251 has 4 divisors (see below), whose sum is σ = 166982592. Its totient is φ = 143127912.

The previous prime is 155055247. The next prime is 155055253. The reversal of 155055251 is 152550551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152550551 = 1237 ⋅123323.

It is a cyclic number.

It is not a de Polignac number, because 155055251 - 2² = 155055247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155055253) 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, 5963651 + ... + 5963676.

It is an arithmetic number, because the mean of its divisors is an integer number (41745648).

Almost surely, 2^155055251 is an apocalyptic number.

155055251 is a deficient number, since it is larger than the sum of its proper divisors (11927341).

155055251 is a wasteful number, since it uses less digits than its factorization.

155055251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11927340.

The product of its (nonzero) digits is 6250, while the sum is 29.

The square root of 155055251 is about 12452.1183338418. The cubic root of 155055251 is about 537.2323539310.

The spelling of 155055251 in words is "one hundred fifty-five million, fifty-five thousand, two hundred fifty-one".