1897071109 has 2 divisors, whose sum is σ = 1897071110. Its totient is φ = 1897071108.

The previous prime is 1897071103. The next prime is 1897071139. The reversal of 1897071109 is 9011707981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190043009 + 707028100 = 34497^2 + 26590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897071109 - 2⁹ = 1897070597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1897071103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948535554 + 948535555.

It is an arithmetic number, because the mean of its divisors is an integer number (948535555).

Almost surely, 2^1897071109 is an apocalyptic number.

It is an amenable number.

1897071109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897071109 is an equidigital number, since it uses as much as digits as its factorization.

1897071109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 43.

The square root of 1897071109 is about 43555.3797940048. The cubic root of 1897071109 is about 1237.9255788103.

The spelling of 1897071109 in words is "one billion, eight hundred ninety-seven million, seventy-one thousand, one hundred nine".