616151021 has 2 divisors, whose sum is σ = 616151022. Its totient is φ = 616151020.

The previous prime is 616150991. The next prime is 616151083. The reversal of 616151021 is 120151616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316341796 + 299809225 = 17786^2 + 17315^2 .

It is a cyclic number.

It is not a de Polignac number, because 616151021 - 2¹⁴ = 616134637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616159021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308075510 + 308075511.

It is an arithmetic number, because the mean of its divisors is an integer number (308075511).

Almost surely, 2^616151021 is an apocalyptic number.

It is an amenable number.

616151021 is a deficient number, since it is larger than the sum of its proper divisors (1).

616151021 is an equidigital number, since it uses as much as digits as its factorization.

616151021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 616151021 is about 24822.3895102788. The cubic root of 616151021 is about 850.9337010850.

The spelling of 616151021 in words is "six hundred sixteen million, one hundred fifty-one thousand, twenty-one".