1662641 has 2 divisors, whose sum is σ = 1662642. Its totient is φ = 1662640.

The previous prime is 1662637. The next prime is 1662643. The reversal of 1662641 is 1462661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1575025 + 87616 = 1255^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662641 - 2² = 1662637 is a prime.

Together with 1662643, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1662641.

It is not a weakly prime, because it can be changed into another prime (1662643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831320 + 831321.

It is an arithmetic number, because the mean of its divisors is an integer number (831321).

2^1662641 is an apocalyptic number.

It is an amenable number.

1662641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662641 is an equidigital number, since it uses as much as digits as its factorization.

1662641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 1662641 is about 1289.4343721183. The cubic root of 1662641 is about 118.4675740770.

The spelling of 1662641 in words is "one million, six hundred sixty-two thousand, six hundred forty-one".