1531642 has 12 divisors (see below), whose sum is σ = 2672730. Its totient is φ = 656376.

The previous prime is 1531633. The next prime is 1531657. The reversal of 1531642 is 2461351.

It can be written as a sum of positive squares in only one way, i.e., 790321 + 741321 = 889^2 + 861^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7717 + ... + 7912.

2^1531642 is an apocalyptic number.

1531642 is a deficient number, since it is larger than the sum of its proper divisors (1141088).

1531642 is a wasteful number, since it uses less digits than its factorization.

1531642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15645 (or 15638 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 1531642 is about 1237.5952488597. The cubic root of 1531642 is about 115.2707420597.

Adding to 1531642 its reverse (2461351), we get a palindrome (3992993).

The spelling of 1531642 in words is "one million, five hundred thirty-one thousand, six hundred forty-two".