501010561 has 4 divisors (see below), whose sum is σ = 517172224. Its totient is φ = 484848900.

The previous prime is 501010547. The next prime is 501010567. The reversal of 501010561 is 165010105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 501010561 - 2⁹ = 501010049 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501010567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8080785 + ... + 8080846.

It is an arithmetic number, because the mean of its divisors is an integer number (129293056).

Almost surely, 2^501010561 is an apocalyptic number.

It is an amenable number.

501010561 is a deficient number, since it is larger than the sum of its proper divisors (16161663).

501010561 is a wasteful number, since it uses less digits than its factorization.

501010561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16161662.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 501010561 is about 22383.2651996977. The cubic root of 501010561 is about 794.2348880068.

Adding to 501010561 its reverse (165010105), we get a palindrome (666020666).

The spelling of 501010561 in words is "five hundred one million, ten thousand, five hundred sixty-one".