617288828021 has 2 divisors, whose sum is σ = 617288828022. Its totient is φ = 617288828020.

The previous prime is 617288828011. The next prime is 617288828033. The reversal of 617288828021 is 120828882716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511589715025 + 105699112996 = 715255^2 + 325114^2 .

It is a cyclic number.

It is not a de Polignac number, because 617288828021 - 2⁶ = 617288827957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617288828011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308644414010 + 308644414011.

It is an arithmetic number, because the mean of its divisors is an integer number (308644414011).

Almost surely, 2^617288828021 is an apocalyptic number.

It is an amenable number.

617288828021 is a deficient number, since it is larger than the sum of its proper divisors (1).

617288828021 is an equidigital number, since it uses as much as digits as its factorization.

617288828021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1376256, while the sum is 53.

The spelling of 617288828021 in words is "six hundred seventeen billion, two hundred eighty-eight million, eight hundred twenty-eight thousand, twenty-one".