155515145 has 4 divisors (see below), whose sum is σ = 186618180. Its totient is φ = 124412112.

The previous prime is 155515141. The next prime is 155515147. The reversal of 155515145 is 541515551.

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 124188736 + 31326409 = 11144^2 + 5597^2 .

It is a cyclic number.

It is not a de Polignac number, because 155515145 - 2² = 155515141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155515141) 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, 15551510 + ... + 15551519.

It is an arithmetic number, because the mean of its divisors is an integer number (46654545).

Almost surely, 2^155515145 is an apocalyptic number.

It is an amenable number.

155515145 is a deficient number, since it is larger than the sum of its proper divisors (31103035).

155515145 is an equidigital number, since it uses as much as digits as its factorization.

155515145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31103034.

The product of its digits is 12500, while the sum is 32.

The square root of 155515145 is about 12470.5711577297. The cubic root of 155515145 is about 537.7629735358.

The spelling of 155515145 in words is "one hundred fifty-five million, five hundred fifteen thousand, one hundred forty-five".