1662631 has 2 divisors, whose sum is σ = 1662632. Its totient is φ = 1662630.

The previous prime is 1662629. The next prime is 1662637. The reversal of 1662631 is 1362661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1662631 - 2¹ = 1662629 is a prime.

It is a super-2 number, since 2×1662631² = 5528683684322, which contains 22 as substring.

Together with 1662629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1662596 and 1662605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662637) 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 as a sum of consecutive naturals, namely, 831315 + 831316.

It is an arithmetic number, because the mean of its divisors is an integer number (831316).

2^1662631 is an apocalyptic number.

1662631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662631 is an equidigital number, since it uses as much as digits as its factorization.

1662631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 1662631 is about 1289.4304944432. The cubic root of 1662631 is about 118.4673365677.

The spelling of 1662631 in words is "one million, six hundred sixty-two thousand, six hundred thirty-one".