2804621861 has 2 divisors, whose sum is σ = 2804621862. Its totient is φ = 2804621860.

The previous prime is 2804621857. The next prime is 2804621887. The reversal of 2804621861 is 1681264082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1709409025 + 1095212836 = 41345^2 + 33094^2 .

It is a cyclic number.

It is not a de Polignac number, because 2804621861 - 2² = 2804621857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2804621761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402310930 + 1402310931.

It is an arithmetic number, because the mean of its divisors is an integer number (1402310931).

Almost surely, 2^2804621861 is an apocalyptic number.

It is an amenable number.

2804621861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2804621861 is an equidigital number, since it uses as much as digits as its factorization.

2804621861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 2804621861 is about 52958.6806954252. The cubic root of 2804621861 is about 1410.2348352217.

The spelling of 2804621861 in words is "two billion, eight hundred four million, six hundred twenty-one thousand, eight hundred sixty-one".