507117221 has 4 divisors (see below), whose sum is σ = 546126252. Its totient is φ = 468108192.

The previous prime is 507117181. The next prime is 507117253. The reversal of 507117221 is 122711705.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122711705 = 5 ⋅24542341.

It can be written as a sum of positive squares in 2 ways, for example, as 65529025 + 441588196 = 8095^2 + 21014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-507117221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (507117421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19504496 + ... + 19504521.

It is an arithmetic number, because the mean of its divisors is an integer number (136531563).

Almost surely, 2^507117221 is an apocalyptic number.

It is an amenable number.

507117221 is a deficient number, since it is larger than the sum of its proper divisors (39009031).

507117221 is a wasteful number, since it uses less digits than its factorization.

507117221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39009030.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 507117221 is about 22519.2633316456. The cubic root of 507117221 is about 797.4487585451.

Adding to 507117221 its reverse (122711705), we get a palindrome (629828926).

The spelling of 507117221 in words is "five hundred seven million, one hundred seventeen thousand, two hundred twenty-one".