155693149 has 4 divisors (see below), whose sum is σ = 155744764. Its totient is φ = 155641536.

The previous prime is 155693137. The next prime is 155693183. The reversal of 155693149 is 941396551.

155693149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 132825625 + 22867524 = 11525^2 + 4782^2 .

It is a cyclic number.

It is not a de Polignac number, because 155693149 - 2¹¹ = 155691101 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 (155693189) 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, 20982 + ... + 27415.

It is an arithmetic number, because the mean of its divisors is an integer number (38936191).

Almost surely, 2^155693149 is an apocalyptic number.

It is an amenable number.

155693149 is a deficient number, since it is larger than the sum of its proper divisors (51615).

155693149 is an equidigital number, since it uses as much as digits as its factorization.

155693149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51614.

The product of its digits is 145800, while the sum is 43.

The square root of 155693149 is about 12477.7060792439. The cubic root of 155693149 is about 537.9680713767.

The spelling of 155693149 in words is "one hundred fifty-five million, six hundred ninety-three thousand, one hundred forty-nine".