1881641533 has 2 divisors, whose sum is σ = 1881641534. Its totient is φ = 1881641532.

The previous prime is 1881641491. The next prime is 1881641543. The reversal of 1881641533 is 3351461881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1219196889 + 662444644 = 34917^2 + 25738^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881641533 - 2²⁹ = 1344770621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881641543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940820766 + 940820767.

It is an arithmetic number, because the mean of its divisors is an integer number (940820767).

Almost surely, 2^1881641533 is an apocalyptic number.

It is an amenable number.

1881641533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881641533 is an equidigital number, since it uses as much as digits as its factorization.

1881641533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 1881641533 is about 43377.8922148138. The cubic root of 1881641533 is about 1234.5602707096.

The spelling of 1881641533 in words is "one billion, eight hundred eighty-one million, six hundred forty-one thousand, five hundred thirty-three".