616511801 has 2 divisors, whose sum is σ = 616511802. Its totient is φ = 616511800.

The previous prime is 616511773. The next prime is 616511809. The reversal of 616511801 is 108115616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612810025 + 3701776 = 24755^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 616511801 - 2¹⁸ = 616249657 is a prime.

It is not a weakly prime, because it can be changed into another prime (616511809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308255900 + 308255901.

It is an arithmetic number, because the mean of its divisors is an integer number (308255901).

Almost surely, 2^616511801 is an apocalyptic number.

It is an amenable number.

616511801 is a deficient number, since it is larger than the sum of its proper divisors (1).

616511801 is an equidigital number, since it uses as much as digits as its factorization.

616511801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 616511801 is about 24829.6556762272. The cubic root of 616511801 is about 851.0997534270.

The spelling of 616511801 in words is "six hundred sixteen million, five hundred eleven thousand, eight hundred one".