1971199 has 2 divisors, whose sum is σ = 1971200. Its totient is φ = 1971198.

The previous prime is 1971181. The next prime is 1971209. The reversal of 1971199 is 9911791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985599 + 985600.

It is an arithmetic number, because the mean of its divisors is an integer number (985600).

2^1971199 is an apocalyptic number.

1971199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971199 is an equidigital number, since it uses as much as digits as its factorization.

1971199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103, while the sum is 37.

The square root of 1971199 is about 1403.9939458559. The cubic root of 1971199 is about 125.3843953765.

The spelling of 1971199 in words is "one million, nine hundred seventy-one thousand, one hundred ninety-nine".