606155021 has 2 divisors, whose sum is σ = 606155022. Its totient is φ = 606155020.

The previous prime is 606154981. The next prime is 606155023. The reversal of 606155021 is 120551606.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604914025 + 1240996 = 24595^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 606155021 - 2¹⁸ = 605892877 is a prime.

Together with 606155023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (606155023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303077510 + 303077511.

It is an arithmetic number, because the mean of its divisors is an integer number (303077511).

Almost surely, 2^606155021 is an apocalyptic number.

It is an amenable number.

606155021 is a deficient number, since it is larger than the sum of its proper divisors (1).

606155021 is an equidigital number, since it uses as much as digits as its factorization.

606155021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 606155021 is about 24620.2156976741. The cubic root of 606155021 is about 846.3069401180.

The spelling of 606155021 in words is "six hundred six million, one hundred fifty-five thousand, twenty-one".