1685143073931 has 4 divisors (see below), whose sum is σ = 2246857431912. Its totient is φ = 1123428715952.

The previous prime is 1685143073899. The next prime is 1685143073951. The reversal of 1685143073931 is 1393703415861.

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 1685143073931 - 2⁵ = 1685143073899 is a prime.

It is a super-2 number, since 2×1685143073931² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1685143073951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280857178986 + ... + 280857178991.

It is an arithmetic number, because the mean of its divisors is an integer number (561714357978).

Almost surely, 2^{1685143073931} is an apocalyptic number.

1685143073931 is a deficient number, since it is larger than the sum of its proper divisors (561714357981).

1685143073931 is an equidigital number, since it uses as much as digits as its factorization.

1685143073931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561714357980.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 1685143073931 in words is "one trillion, six hundred eighty-five billion, one hundred forty-three million, seventy-three thousand, nine hundred thirty-one".