1663131 has 4 divisors (see below), whose sum is σ = 2217512. Its totient is φ = 1108752.

The previous prime is 1663117. The next prime is 1663133. The reversal of 1663131 is 1313661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1663131 - 2⁵ = 1663099 is a prime.

It is a super-2 number, since 2×1663131² = 5532009446322, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663098 and 1663107.

It is not an unprimeable number, because it can be changed into a prime (1663133) 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, 277186 + ... + 277191.

It is an arithmetic number, because the mean of its divisors is an integer number (554378).

2^1663131 is an apocalyptic number.

1663131 is a deficient number, since it is larger than the sum of its proper divisors (554381).

1663131 is an equidigital number, since it uses as much as digits as its factorization.

1663131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554380.

The product of its digits is 324, while the sum is 21.

The square root of 1663131 is about 1289.6243639138. The cubic root of 1663131 is about 118.4792108664.

Adding to 1663131 its reverse (1313661), we get a palindrome (2976792).

The spelling of 1663131 in words is "one million, six hundred sixty-three thousand, one hundred thirty-one".