515455 has 4 divisors (see below), whose sum is σ = 618552. Its totient is φ = 412360.

The previous prime is 515429. The next prime is 515477. The reversal of 515455 is 554515.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 515455 - 2¹¹ = 513407 is a prime.

It is a Duffinian number.

515455 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51541 + ... + 51550.

It is an arithmetic number, because the mean of its divisors is an integer number (154638).

2⁵¹⁵⁴⁵⁵ is an apocalyptic number.

515455 is a deficient number, since it is larger than the sum of its proper divisors (103097).

515455 is a wasteful number, since it uses less digits than its factorization.

515455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103096.

The product of its digits is 2500, while the sum is 25.

The square root of 515455 is about 717.9519482528. The cubic root of 515455 is about 80.1795446616.

Subtracting 515455 from its reverse (554515), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 515455 in words is "five hundred fifteen thousand, four hundred fifty-five".