155020545 has 12 divisors (see below), whose sum is σ = 268702356. Its totient is φ = 82677600.

The previous prime is 155020517. The next prime is 155020559. The reversal of 155020545 is 545020551.

It can be written as a sum of positive squares in 2 ways, for example, as 49999041 + 105021504 = 7071^2 + 10248^2 .

It is not a de Polignac number, because 155020545 - 2¹⁰ = 155019521 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1722406 + ... + 1722495.

It is an arithmetic number, because the mean of its divisors is an integer number (22391863).

Almost surely, 2^155020545 is an apocalyptic number.

155020545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155020545 is a deficient number, since it is larger than the sum of its proper divisors (113681811).

155020545 is a wasteful number, since it uses less digits than its factorization.

155020545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444912 (or 3444909 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 155020545 is about 12450.7246777045. The cubic root of 155020545 is about 537.1922680536.

The spelling of 155020545 in words is "one hundred fifty-five million, twenty thousand, five hundred forty-five".