1971121 has 4 divisors (see below), whose sum is σ = 1984500. Its totient is φ = 1957744.

The previous prime is 1971119. The next prime is 1971127. The reversal of 1971121 is 1211791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1290496 + 680625 = 1136^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971121 - 2¹ = 1971119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1971092 and 1971101.

It is not an unprimeable number, because it can be changed into a prime (1971127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6466 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (496125).

2^1971121 is an apocalyptic number.

It is an amenable number.

1971121 is a deficient number, since it is larger than the sum of its proper divisors (13379).

1971121 is a wasteful number, since it uses less digits than its factorization.

1971121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13378.

The product of its digits is 126, while the sum is 22.

The square root of 1971121 is about 1403.9661676835. The cubic root of 1971121 is about 125.3827415418.

The spelling of 1971121 in words is "one million, nine hundred seventy-one thousand, one hundred twenty-one".