155438233 has 4 divisors (see below), whose sum is σ = 157184820. Its totient is φ = 153691648.

The previous prime is 155438203. The next prime is 155438237. The reversal of 155438233 is 332834551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98465929 + 56972304 = 9923^2 + 7548^2 .

It is a cyclic number.

It is not a de Polignac number, because 155438233 - 2⁵ = 155438201 is a prime.

It is a super-2 number, since 2×155438233² = 48322088556324578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155438237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873160 + ... + 873337.

It is an arithmetic number, because the mean of its divisors is an integer number (39296205).

Almost surely, 2^155438233 is an apocalyptic number.

It is an amenable number.

155438233 is a deficient number, since it is larger than the sum of its proper divisors (1746587).

155438233 is an equidigital number, since it uses as much as digits as its factorization.

155438233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746586.

The product of its digits is 43200, while the sum is 34.

The square root of 155438233 is about 12467.4870362876. The cubic root of 155438233 is about 537.6743064028.

The spelling of 155438233 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, two hundred thirty-three".