1881961033 has 2 divisors, whose sum is σ = 1881961034. Its totient is φ = 1881961032.

The previous prime is 1881961031. The next prime is 1881961043. The reversal of 1881961033 is 3301691881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1797081664 + 84879369 = 42392^2 + 9213^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881961033 - 2¹ = 1881961031 is a prime.

Together with 1881961031, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1881961031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940980516 + 940980517.

It is an arithmetic number, because the mean of its divisors is an integer number (940980517).

Almost surely, 2^1881961033 is an apocalyptic number.

It is an amenable number.

1881961033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881961033 is an equidigital number, since it uses as much as digits as its factorization.

1881961033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1881961033 is about 43381.5748100504. The cubic root of 1881961033 is about 1234.6301422689.

The spelling of 1881961033 in words is "one billion, eight hundred eighty-one million, nine hundred sixty-one thousand, thirty-three".