7881401819 has 2 divisors, whose sum is σ = 7881401820. Its totient is φ = 7881401818.

The previous prime is 7881401809. The next prime is 7881401893. The reversal of 7881401819 is 9181041887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7881401819 - 2¹² = 7881397723 is a prime.

It is a super-2 number, since 2×7881401819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7881401809) 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, 3940700909 + 3940700910.

It is an arithmetic number, because the mean of its divisors is an integer number (3940700910).

Almost surely, 2^7881401819 is an apocalyptic number.

7881401819 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881401819 is an equidigital number, since it uses as much as digits as its factorization.

7881401819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 47.

The square root of 7881401819 is about 88777.2595826206. The cubic root of 7881401819 is about 1990.0675733559.

The spelling of 7881401819 in words is "seven billion, eight hundred eighty-one million, four hundred one thousand, eight hundred nineteen".