2859809621 has 2 divisors, whose sum is σ = 2859809622. Its totient is φ = 2859809620.

The previous prime is 2859809609. The next prime is 2859809633. The reversal of 2859809621 is 1269089582.

It is a balanced prime because it is at equal distance from previous prime (2859809609) and next prime (2859809633).

It can be written as a sum of positive squares in only one way, i.e., 1899739396 + 960070225 = 43586^2 + 30985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2859809621 - 2¹⁰ = 2859808597 is a prime.

It is a super-2 number, since 2×2859809621² = 16357022136728327282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2859809621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2859809671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1429904810 + 1429904811.

It is an arithmetic number, because the mean of its divisors is an integer number (1429904811).

Almost surely, 2^2859809621 is an apocalyptic number.

It is an amenable number.

2859809621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2859809621 is an equidigital number, since it uses as much as digits as its factorization.

2859809621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 2859809621 is about 53477.1878561317. The cubic root of 2859809621 is about 1419.4247522836.

The spelling of 2859809621 in words is "two billion, eight hundred fifty-nine million, eight hundred nine thousand, six hundred twenty-one".