501616121 has 2 divisors, whose sum is σ = 501616122. Its totient is φ = 501616120.

The previous prime is 501616097. The next prime is 501616139. The reversal of 501616121 is 121616105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363436096 + 138180025 = 19064^2 + 11755^2 .

It is a cyclic number.

It is not a de Polignac number, because 501616121 - 2¹⁰ = 501615097 is a prime.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (501616151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250808060 + 250808061.

It is an arithmetic number, because the mean of its divisors is an integer number (250808061).

Almost surely, 2^501616121 is an apocalyptic number.

It is an amenable number.

501616121 is a deficient number, since it is larger than the sum of its proper divisors (1).

501616121 is an equidigital number, since it uses as much as digits as its factorization.

501616121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 501616121 is about 22396.7881849162. The cubic root of 501616121 is about 794.5547503493.

The spelling of 501616121 in words is "five hundred one million, six hundred sixteen thousand, one hundred twenty-one".