1663351 has 2 divisors, whose sum is σ = 1663352. Its totient is φ = 1663350.

The previous prime is 1663349. The next prime is 1663373. The reversal of 1663351 is 1533661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1663351 - 2¹ = 1663349 is a prime.

Together with 1663349, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831675 + 831676.

It is an arithmetic number, because the mean of its divisors is an integer number (831676).

2^1663351 is an apocalyptic number.

1663351 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663351 is an equidigital number, since it uses as much as digits as its factorization.

1663351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 25.

The square root of 1663351 is about 1289.7096572485. The cubic root of 1663351 is about 118.4844348039.

The spelling of 1663351 in words is "one million, six hundred sixty-three thousand, three hundred fifty-one".