1890964897 has 2 divisors, whose sum is σ = 1890964898. Its totient is φ = 1890964896.

The previous prime is 1890964853. The next prime is 1890964921. The reversal of 1890964897 is 7984690981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1869351696 + 21613201 = 43236^2 + 4649^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890964897 - 2⁷ = 1890964769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890964837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945482448 + 945482449.

It is an arithmetic number, because the mean of its divisors is an integer number (945482449).

Almost surely, 2^1890964897 is an apocalyptic number.

It is an amenable number.

1890964897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890964897 is an equidigital number, since it uses as much as digits as its factorization.

1890964897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 61.

The square root of 1890964897 is about 43485.2261923518. The cubic root of 1890964897 is about 1236.5959571008.

The spelling of 1890964897 in words is "one billion, eight hundred ninety million, nine hundred sixty-four thousand, eight hundred ninety-seven".