155000551 has 4 divisors (see below), whose sum is σ = 155399400. Its totient is φ = 154601704.

The previous prime is 155000533. The next prime is 155000557.

155000551 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155000551 - 2⁹ = 155000039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155000557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198841 + ... + 199618.

It is an arithmetic number, because the mean of its divisors is an integer number (38849850).

Almost surely, 2^155000551 is an apocalyptic number.

155000551 is a deficient number, since it is larger than the sum of its proper divisors (398849).

155000551 is an equidigital number, since it uses as much as digits as its factorization.

155000551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398848.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 155000551 is about 12449.9217266616. The cubic root of 155000551 is about 537.1691720096.

It can be divided in two parts, 155000 and 551, that added together give a palindrome (155551).

The spelling of 155000551 in words is "one hundred fifty-five million, five hundred fifty-one", and thus it is an aban number.