1971289 has 2 divisors, whose sum is σ = 1971290. Its totient is φ = 1971288.

The previous prime is 1971253. The next prime is 1971313. The reversal of 1971289 is 9821791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 242064 = 1315^2 + 492^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971289 - 2⁷ = 1971161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985644 + 985645.

It is an arithmetic number, because the mean of its divisors is an integer number (985645).

2^1971289 is an apocalyptic number.

It is an amenable number.

1971289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971289 is an equidigital number, since it uses as much as digits as its factorization.

1971289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 37.

The square root of 1971289 is about 1404.0259969103. The cubic root of 1971289 is about 125.3863035931.

The spelling of 1971289 in words is "one million, nine hundred seventy-one thousand, two hundred eighty-nine".