1631663 has 16 divisors (see below), whose sum is σ = 1933440. Its totient is φ = 1360800.

The previous prime is 1631659. The next prime is 1631683. The reversal of 1631663 is 3661361.

It is a cyclic number.

It is not a de Polignac number, because 1631663 - 2² = 1631659 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7628 + ... + 7838.

It is an arithmetic number, because the mean of its divisors is an integer number (120840).

2^1631663 is an apocalyptic number.

1631663 is a deficient number, since it is larger than the sum of its proper divisors (301777).

1631663 is a wasteful number, since it uses less digits than its factorization.

1631663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its digits is 1944, while the sum is 26.

The square root of 1631663 is about 1277.3656485126. The cubic root of 1631663 is about 117.7272018586.

The spelling of 1631663 in words is "one million, six hundred thirty-one thousand, six hundred sixty-three".