155320173 has 40 divisors (see below), whose sum is σ = 243796608. Its totient is φ = 98356896.

The previous prime is 155320159. The next prime is 155320247. The reversal of 155320173 is 371023551.

It is not a de Polignac number, because 155320173 - 2¹⁰ = 155319149 is a prime.

It is a super-2 number, since 2×155320173² = 48248712281499858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155320153) 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 39 ways as a sum of consecutive naturals, for example, 489811 + ... + 490127.

Almost surely, 2^155320173 is an apocalyptic number.

It is an amenable number.

155320173 is a deficient number, since it is larger than the sum of its proper divisors (88476435).

155320173 is a wasteful number, since it uses less digits than its factorization.

155320173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 155320173 is about 12462.7514217367. The cubic root of 155320173 is about 537.5381453368.

The spelling of 155320173 in words is "one hundred fifty-five million, three hundred twenty thousand, one hundred seventy-three".