508091561 has 4 divisors (see below), whose sum is σ = 508137300. Its totient is φ = 508045824.

The previous prime is 508091503. The next prime is 508091579. The reversal of 508091561 is 165190805.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 379041961 + 129049600 = 19469^2 + 11360^2 .

It is a cyclic number.

It is not a de Polignac number, because 508091561 - 2¹⁴ = 508075177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (508091161) 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, 5645 + ... + 32373.

It is an arithmetic number, because the mean of its divisors is an integer number (127034325).

Almost surely, 2^508091561 is an apocalyptic number.

It is an amenable number.

508091561 is a deficient number, since it is larger than the sum of its proper divisors (45739).

508091561 is a wasteful number, since it uses less digits than its factorization.

508091561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45738.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 508091561 is about 22540.8864288874. The cubic root of 508091561 is about 797.9591527931.

The spelling of 508091561 in words is "five hundred eight million, ninety-one thousand, five hundred sixty-one".