155312193 has 4 divisors (see below), whose sum is σ = 207082928. Its totient is φ = 103541460.

The previous prime is 155312191. The next prime is 155312203. The reversal of 155312193 is 391213551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 391213551 = 3 ⋅130404517.

It is not a de Polignac number, because 155312193 - 2¹ = 155312191 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155312193.

It is not an unprimeable number, because it can be changed into a prime (155312191) 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, 25885363 + ... + 25885368.

It is an arithmetic number, because the mean of its divisors is an integer number (51770732).

Almost surely, 2^155312193 is an apocalyptic number.

It is an amenable number.

155312193 is a deficient number, since it is larger than the sum of its proper divisors (51770735).

155312193 is an equidigital number, since it uses as much as digits as its factorization.

155312193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51770734.

The product of its digits is 4050, while the sum is 30.

The square root of 155312193 is about 12462.4312636018. The cubic root of 155312193 is about 537.5289393469.

The spelling of 155312193 in words is "one hundred fifty-five million, three hundred twelve thousand, one hundred ninety-three".