501505601161 has 2 divisors, whose sum is σ = 501505601162. Its totient is φ = 501505601160.

The previous prime is 501505601137. The next prime is 501505601183. The reversal of 501505601161 is 161106505105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482587249225 + 18918351936 = 694685^2 + 137544^2 .

It is a cyclic number.

It is not a de Polignac number, because 501505601161 - 2²⁵ = 501472046729 is a prime.

It is not a weakly prime, because it can be changed into another prime (501505601101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250752800580 + 250752800581.

It is an arithmetic number, because the mean of its divisors is an integer number (250752800581).

Almost surely, 2^501505601161 is an apocalyptic number.

It is an amenable number.

501505601161 is a deficient number, since it is larger than the sum of its proper divisors (1).

501505601161 is an equidigital number, since it uses as much as digits as its factorization.

501505601161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 501505601161 in words is "five hundred one billion, five hundred five million, six hundred one thousand, one hundred sixty-one".