155615145 has 16 divisors (see below), whose sum is σ = 284553600. Its totient is φ = 71138304.

The previous prime is 155615143. The next prime is 155615147. The reversal of 155615145 is 541516551.

It is an interprime number because it is at equal distance from previous prime (155615143) and next prime (155615147).

It is not a de Polignac number, because 155615145 - 2¹ = 155615143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155615143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 740920 + ... + 741129.

It is an arithmetic number, because the mean of its divisors is an integer number (17784600).

Almost surely, 2^155615145 is an apocalyptic number.

155615145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155615145 is a deficient number, since it is larger than the sum of its proper divisors (128938455).

155615145 is a wasteful number, since it uses less digits than its factorization.

155615145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482064.

The product of its digits is 15000, while the sum is 33.

The square root of 155615145 is about 12474.5799528481. The cubic root of 155615145 is about 537.8782137053.

It can be divided in two parts, 15561 and 5145, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 155615145 in words is "one hundred fifty-five million, six hundred fifteen thousand, one hundred forty-five".