515505145 has 8 divisors (see below), whose sum is σ = 624282120. Its totient is φ = 408620160.

The previous prime is 515505139. The next prime is 515505157. The reversal of 515505145 is 541505515.

515505145 = 67² + 68² + ... + 1156².

It can be written as a sum of positive squares in 4 ways, for example, as 176650681 + 338854464 = 13291^2 + 18408^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 515505145 - 2²³ = 507116537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472396 + ... + 473485.

It is an arithmetic number, because the mean of its divisors is an integer number (78035265).

Almost surely, 2^515505145 is an apocalyptic number.

It is an amenable number.

515505145 is a deficient number, since it is larger than the sum of its proper divisors (108776975).

515505145 is a wasteful number, since it uses less digits than its factorization.

515505145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945995.

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

The square root of 515505145 is about 22704.7383821087. The cubic root of 515505145 is about 801.8214461243.

The spelling of 515505145 in words is "five hundred fifteen million, five hundred five thousand, one hundred forty-five".