1971089 has 4 divisors (see below), whose sum is σ = 1973940. Its totient is φ = 1968240.

The previous prime is 1971049. The next prime is 1971091. The reversal of 1971089 is 9801791.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1481089 + 490000 = 1217^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971089 - 2²⁰ = 922513 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1971029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (493485).

2^1971089 is an apocalyptic number.

It is an amenable number.

1971089 is a deficient number, since it is larger than the sum of its proper divisors (2851).

1971089 is a wasteful number, since it uses less digits than its factorization.

1971089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1971089 is about 1403.9547713513. The cubic root of 1971089 is about 125.3820630329.

The spelling of 1971089 in words is "one million, nine hundred seventy-one thousand, eighty-nine".