1945090897 has 2 divisors, whose sum is σ = 1945090898. Its totient is φ = 1945090896.

The previous prime is 1945090891. The next prime is 1945090951. The reversal of 1945090897 is 7980905491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1771483921 + 173606976 = 42089^2 + 13176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945090897 - 2²³ = 1936702289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1945090891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972545448 + 972545449.

It is an arithmetic number, because the mean of its divisors is an integer number (972545449).

Almost surely, 2^1945090897 is an apocalyptic number.

It is an amenable number.

1945090897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945090897 is an equidigital number, since it uses as much as digits as its factorization.

1945090897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 1945090897 is about 44103.1846582534. The cubic root of 1945090897 is about 1248.2837025637.

The spelling of 1945090897 in words is "one billion, nine hundred forty-five million, ninety thousand, eight hundred ninety-seven".