1897920641 has 2 divisors, whose sum is σ = 1897920642. Its totient is φ = 1897920640.

The previous prime is 1897920611. The next prime is 1897920653. The reversal of 1897920641 is 1460297981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1831840000 + 66080641 = 42800^2 + 8129^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897920641 - 2¹⁴ = 1897904257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1897920611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948960320 + 948960321.

It is an arithmetic number, because the mean of its divisors is an integer number (948960321).

Almost surely, 2^1897920641 is an apocalyptic number.

It is an amenable number.

1897920641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897920641 is an equidigital number, since it uses as much as digits as its factorization.

1897920641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 1897920641 is about 43565.1310224129. The cubic root of 1897920641 is about 1238.1103373828.

The spelling of 1897920641 in words is "one billion, eight hundred ninety-seven million, nine hundred twenty thousand, six hundred forty-one".