501418561 has 32 divisors (see below), whose sum is σ = 629411328. Its totient is φ = 390044160.

The previous prime is 501418549. The next prime is 501418573. The reversal of 501418561 is 165814105.

It is an interprime number because it is at equal distance from previous prime (501418549) and next prime (501418573).

It is a cyclic number.

It is not a de Polignac number, because 501418561 - 2²¹ = 499321409 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (501418861) 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 31 ways as a sum of consecutive naturals, for example, 243211 + ... + 245263.

It is an arithmetic number, because the mean of its divisors is an integer number (19669104).

Almost surely, 2^501418561 is an apocalyptic number.

It is an amenable number.

501418561 is a deficient number, since it is larger than the sum of its proper divisors (127992767).

501418561 is a wasteful number, since it uses less digits than its factorization.

501418561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 501418561 is about 22392.3772967499. The cubic root of 501418561 is about 794.4504256529.

The spelling of 501418561 in words is "five hundred one million, four hundred eighteen thousand, five hundred sixty-one".