1680206531 has 4 divisors (see below), whose sum is σ = 1680502464. Its totient is φ = 1679910600.

The previous prime is 1680206513. The next prime is 1680206569. The reversal of 1680206531 is 1356020861.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1680206531 - 2¹⁰ = 1680205507 is a prime.

It is a super-2 number, since 2×1680206531² = 5646187973630107922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680206581) 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, 139280 + ... + 150861.

It is an arithmetic number, because the mean of its divisors is an integer number (420125616).

Almost surely, 2^1680206531 is an apocalyptic number.

1680206531 is a deficient number, since it is larger than the sum of its proper divisors (295933).

1680206531 is an equidigital number, since it uses as much as digits as its factorization.

1680206531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295932.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1680206531 is about 40990.3224066364. The cubic root of 1680206531 is about 1188.8331030067.

The spelling of 1680206531 in words is "one billion, six hundred eighty million, two hundred six thousand, five hundred thirty-one".