1589981 has 2 divisors, whose sum is σ = 1589982. Its totient is φ = 1589980.

The previous prime is 1589969. The next prime is 1590019. The reversal of 1589981 is 1899851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1585081 + 4900 = 1259^2 + 70^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1589981 is a prime.

It is a super-2 number, since 2×1589981² = 5056079160722, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1589911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 794990 + 794991.

It is an arithmetic number, because the mean of its divisors is an integer number (794991).

2^1589981 is an apocalyptic number.

It is an amenable number.

1589981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1589981 is an equidigital number, since it uses as much as digits as its factorization.

1589981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 41.

The square root of 1589981 is about 1260.9444872793. The cubic root of 1589981 is about 116.7160670612.

The spelling of 1589981 in words is "one million, five hundred eighty-nine thousand, nine hundred eighty-one".