1611971 has 2 divisors, whose sum is σ = 1611972. Its totient is φ = 1611970.

The previous prime is 1611949. The next prime is 1612007. The reversal of 1611971 is 1791161.

It is a weak prime.

It is an emirp because it is prime and its reverse (1791161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1611971 - 2¹⁸ = 1349827 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1611971.

It is not a weakly prime, because it can be changed into another prime (1611901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805985 + 805986.

It is an arithmetic number, because the mean of its divisors is an integer number (805986).

2^1611971 is an apocalyptic number.

1611971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611971 is an equidigital number, since it uses as much as digits as its factorization.

1611971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378, while the sum is 26.

The square root of 1611971 is about 1269.6341992873. The cubic root of 1611971 is about 117.2516801980.

The spelling of 1611971 in words is "one million, six hundred eleven thousand, nine hundred seventy-one".