1989531 has 6 divisors (see below), whose sum is σ = 2873780. Its totient is φ = 1326348.

The previous prime is 1989517. The next prime is 1989551. The reversal of 1989531 is 1359891.

It is a happy number.

It is not a de Polignac number, because 1989531 - 2⁵ = 1989499 is a prime.

It is a super-2 number, since 2×1989531² = 7916467199922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110521 + ... + 110538.

2^1989531 is an apocalyptic number.

1989531 is a deficient number, since it is larger than the sum of its proper divisors (884249).

1989531 is a wasteful number, since it uses less digits than its factorization.

1989531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221065 (or 221062 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1989531 is about 1410.5073555285. The cubic root of 1989531 is about 125.7718850698.

The spelling of 1989531 in words is "one million, nine hundred eighty-nine thousand, five hundred thirty-one".