1681503937 has 4 divisors (see below), whose sum is σ = 1690794196. Its totient is φ = 1672213680.

The previous prime is 1681503919. The next prime is 1681503959. The reversal of 1681503937 is 7393051861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 615089601 + 1066414336 = 24801^2 + 32656^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681503937 - 2⁷ = 1681503809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1681503893 and 1681503902.

It is not an unprimeable number, because it can be changed into a prime (1681503907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4644858 + ... + 4645219.

It is an arithmetic number, because the mean of its divisors is an integer number (422698549).

Almost surely, 2^1681503937 is an apocalyptic number.

It is an amenable number.

1681503937 is a deficient number, since it is larger than the sum of its proper divisors (9290259).

1681503937 is an equidigital number, since it uses as much as digits as its factorization.

1681503937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9290258.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 1681503937 is about 41006.1451126535. The cubic root of 1681503937 is about 1189.1390182507.

The spelling of 1681503937 in words is "one billion, six hundred eighty-one million, five hundred three thousand, nine hundred thirty-seven".