155613145 has 4 divisors (see below), whose sum is σ = 186735780. Its totient is φ = 124490512.

The previous prime is 155613137. The next prime is 155613169. The reversal of 155613145 is 541316551.

It is a happy number.

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 82664464 + 72948681 = 9092^2 + 8541^2 .

It is a cyclic number.

It is not a de Polignac number, because 155613145 - 2³ = 155613137 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15561310 + ... + 15561319.

It is an arithmetic number, because the mean of its divisors is an integer number (46683945).

Almost surely, 2^155613145 is an apocalyptic number.

It is an amenable number.

155613145 is a deficient number, since it is larger than the sum of its proper divisors (31122635).

155613145 is an equidigital number, since it uses as much as digits as its factorization.

155613145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31122634.

The product of its digits is 9000, while the sum is 31.

The square root of 155613145 is about 12474.4997895707. The cubic root of 155613145 is about 537.8759093858.

Adding to 155613145 its reverse (541316551), we get a palindrome (696929696).

The spelling of 155613145 in words is "one hundred fifty-five million, six hundred thirteen thousand, one hundred forty-five".