1881297641 has 2 divisors, whose sum is σ = 1881297642. Its totient is φ = 1881297640.

The previous prime is 1881297569. The next prime is 1881297667. The reversal of 1881297641 is 1467921881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1360134400 + 521163241 = 36880^2 + 22829^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881297641 - 2²² = 1877103337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1881297241) 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, 940648820 + 940648821.

It is an arithmetic number, because the mean of its divisors is an integer number (940648821).

Almost surely, 2^1881297641 is an apocalyptic number.

It is an amenable number.

1881297641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881297641 is an equidigital number, since it uses as much as digits as its factorization.

1881297641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 47.

The square root of 1881297641 is about 43373.9281250845. The cubic root of 1881297641 is about 1234.4850560172.

The spelling of 1881297641 in words is "one billion, eight hundred eighty-one million, two hundred ninety-seven thousand, six hundred forty-one".