1999025881 has 2 divisors, whose sum is σ = 1999025882. Its totient is φ = 1999025880.

The previous prime is 1999025863. The next prime is 1999025909. The reversal of 1999025881 is 1885209991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1989160000 + 9865881 = 44600^2 + 3141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999025881 is a prime.

It is a super-2 number, since 2×1999025881² = 7992208945815652322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1999025081) 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, 999512940 + 999512941.

It is an arithmetic number, because the mean of its divisors is an integer number (999512941).

Almost surely, 2^1999025881 is an apocalyptic number.

It is an amenable number.

1999025881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999025881 is an equidigital number, since it uses as much as digits as its factorization.

1999025881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 52.

The square root of 1999025881 is about 44710.4672420229. The cubic root of 1999025881 is about 1259.7164645040.

The spelling of 1999025881 in words is "one billion, nine hundred ninety-nine million, twenty-five thousand, eight hundred eighty-one".