515550145 has 12 divisors (see below), whose sum is σ = 680015700. Its totient is φ = 374945120.

The previous prime is 515550137. The next prime is 515550149. The reversal of 515550145 is 541055515.

It can be written as a sum of positive squares in 2 ways, for example, as 320696464 + 194853681 = 17908^2 + 13959^2 .

It is not a de Polignac number, because 515550145 - 2³ = 515550137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (515550149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425470 + ... + 426679.

It is an arithmetic number, because the mean of its divisors is an integer number (56667975).

Almost surely, 2^515550145 is an apocalyptic number.

515550145 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

515550145 is a deficient number, since it is larger than the sum of its proper divisors (164465555).

515550145 is a wasteful number, since it uses less digits than its factorization.

515550145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852176 (or 852165 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 31.

The square root of 515550145 is about 22705.7293430535. The cubic root of 515550145 is about 801.8447765835.

The spelling of 515550145 in words is "five hundred fifteen million, five hundred fifty thousand, one hundred forty-five".