1687345231 has 8 divisors (see below), whose sum is σ = 1982335824. Its totient is φ = 1415953920.

The previous prime is 1687345207. The next prime is 1687345237. The reversal of 1687345231 is 1325437861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1687345231 - 2²¹ = 1685248079 is a prime.

It is a super-2 number, since 2×1687345231² = 5694267857156886722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687345237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5899666 + ... + 5899951.

It is an arithmetic number, because the mean of its divisors is an integer number (247791978).

Almost surely, 2^1687345231 is an apocalyptic number.

1687345231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1687345231 is a deficient number, since it is larger than the sum of its proper divisors (294990593).

1687345231 is a wasteful number, since it uses less digits than its factorization.

1687345231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11799641.

The product of its digits is 120960, while the sum is 40.

The square root of 1687345231 is about 41077.3079814148. The cubic root of 1687345231 is about 1190.5143907562.

The spelling of 1687345231 in words is "one billion, six hundred eighty-seven million, three hundred forty-five thousand, two hundred thirty-one".