1878563161 has 2 divisors, whose sum is σ = 1878563162. Its totient is φ = 1878563160.

The previous prime is 1878563123. The next prime is 1878563201. The reversal of 1878563161 is 1613658781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084450761 + 794112400 = 32931^2 + 28180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1878563161 - 2¹⁵ = 1878530393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1878563861) 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, 939281580 + 939281581.

It is an arithmetic number, because the mean of its divisors is an integer number (939281581).

Almost surely, 2^1878563161 is an apocalyptic number.

It is an amenable number.

1878563161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1878563161 is an equidigital number, since it uses as much as digits as its factorization.

1878563161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 1878563161 is about 43342.3945000735. The cubic root of 1878563161 is about 1233.8866549514.

The spelling of 1878563161 in words is "one billion, eight hundred seventy-eight million, five hundred sixty-three thousand, one hundred sixty-one".