1681509736 has 16 divisors (see below), whose sum is σ = 3156740100. Its totient is φ = 839712384.

The previous prime is 1681509703. The next prime is 1681509749. The reversal of 1681509736 is 6379051861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1575296100 + 106213636 = 39690^2 + 10306^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123435 + ... + 136378.

Almost surely, 2^1681509736 is an apocalyptic number.

It is an amenable number.

1681509736 is a deficient number, since it is larger than the sum of its proper divisors (1475230364).

1681509736 is a wasteful number, since it uses less digits than its factorization.

1681509736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260628 (or 260624 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1681509736 is about 41006.2158215069. The cubic root of 1681509736 is about 1189.1403852431.

The spelling of 1681509736 in words is "one billion, six hundred eighty-one million, five hundred nine thousand, seven hundred thirty-six".