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1680031 = 13712263
BaseRepresentation
bin110011010001010011111
310011100120101
412122022133
5412230111
6100001531
720165023
oct6321237
93140511
101680031
11a48261
126902a7
1346a902
1431a383
15232bc1
hex19a29f

1680031 has 4 divisors (see below), whose sum is σ = 1692432. Its totient is φ = 1667632.

The previous prime is 1680023. The next prime is 1680071. The reversal of 1680031 is 1300861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1300861 = 12710243.

It is a cyclic number.

It is not a de Polignac number, because 1680031 - 23 = 1680023 is a prime.

It is a super-2 number, since 2×16800312 = 5645008321922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1679990 and 1680008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680071) 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, 5995 + ... + 6268.

It is an arithmetic number, because the mean of its divisors is an integer number (423108).

21680031 is an apocalyptic number.

1680031 is a deficient number, since it is larger than the sum of its proper divisors (12401).

1680031 is a wasteful number, since it uses less digits than its factorization.

1680031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12400.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1680031 is about 1296.1600981360. The cubic root of 1680031 is about 118.8791702475.

Adding to 1680031 its reverse (1300861), we get a palindrome (2980892).

The spelling of 1680031 in words is "one million, six hundred eighty thousand, thirty-one".

Divisors: 1 137 12263 1680031