155709223 has 4 divisors (see below), whose sum is σ = 156127048. Its totient is φ = 155291400.

The previous prime is 155709221. The next prime is 155709247. The reversal of 155709223 is 322907551.

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 155709223 - 2¹ = 155709221 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 (155709221) 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, 208353 + ... + 209098.

It is an arithmetic number, because the mean of its divisors is an integer number (39031762).

Almost surely, 2^155709223 is an apocalyptic number.

155709223 is a deficient number, since it is larger than the sum of its proper divisors (417825).

155709223 is an equidigital number, since it uses as much as digits as its factorization.

155709223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417824.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 155709223 is about 12478.3501713969. The cubic root of 155709223 is about 537.9865842898.

The spelling of 155709223 in words is "one hundred fifty-five million, seven hundred nine thousand, two hundred twenty-three".