508168491 has 16 divisors (see below), whose sum is σ = 689518368. Its totient is φ = 332812800.

The previous prime is 508168489. The next prime is 508168499. The reversal of 508168491 is 194861805.

It is not a de Polignac number, because 508168491 - 2¹ = 508168489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (508168499) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 236281 + ... + 238421.

It is an arithmetic number, because the mean of its divisors is an integer number (43094898).

Almost surely, 2^508168491 is an apocalyptic number.

508168491 is a deficient number, since it is larger than the sum of its proper divisors (181349877).

508168491 is a wasteful number, since it uses less digits than its factorization.

508168491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502.

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 508168491 is about 22542.5928189283. The cubic root of 508168491 is about 797.9994236841. Note that the first 3 decimals are identical.

The spelling of 508168491 in words is "five hundred eight million, one hundred sixty-eight thousand, four hundred ninety-one".