1531486989 has 6 divisors (see below), whose sum is σ = 2212147886. Its totient is φ = 1020991320.

The previous prime is 1531486961. The next prime is 1531486997. The reversal of 1531486989 is 9896841351.

1531486989 is a `hidden beast` number, since 1 + 531 + 48 + 69 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1524277764 + 7209225 = 39042^2 + 2685^2 .

It is not a de Polignac number, because 1531486989 - 2⁹ = 1531486477 is a prime.

It is a super-2 number, since 2×1531486989² = 4690904794952572242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531486949) 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, 85082602 + ... + 85082619.

Almost surely, 2^1531486989 is an apocalyptic number.

It is an amenable number.

1531486989 is a deficient number, since it is larger than the sum of its proper divisors (680660897).

1531486989 is a wasteful number, since it uses less digits than its factorization.

1531486989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170165227 (or 170165224 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 1531486989 is about 39134.2176234558. The cubic root of 1531486989 is about 1152.6685324064.

The spelling of 1531486989 in words is "one billion, five hundred thirty-one million, four hundred eighty-six thousand, nine hundred eighty-nine".