1681263 has 16 divisors (see below), whose sum is σ = 2527840. Its totient is φ = 1104192.

The previous prime is 1681261. The next prime is 1681271. The reversal of 1681263 is 3621861.

It is not a de Polignac number, because 1681263 - 2¹ = 1681261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

1681263 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1545 + ... + 2397.

It is an arithmetic number, because the mean of its divisors is an integer number (157990).

2^1681263 is an apocalyptic number.

1681263 is a deficient number, since it is larger than the sum of its proper divisors (846577).

1681263 is an equidigital number, since it uses as much as digits as its factorization.

1681263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 929 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1681263 is about 1296.6352609736. The cubic root of 1681263 is about 118.9082219638.

It can be divided in two parts, 168 and 1263, that added together give a triangular number (1431 = T₅₃).

The spelling of 1681263 in words is "one million, six hundred eighty-one thousand, two hundred sixty-three".