1653997 has 2 divisors, whose sum is σ = 1653998. Its totient is φ = 1653996.

The previous prime is 1653989. The next prime is 1654013. The reversal of 1653997 is 7993561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958441 + 695556 = 979^2 + 834^2 .

It is a cyclic number.

It is not a de Polignac number, because 1653997 - 2³ = 1653989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1653917) 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, 826998 + 826999.

It is an arithmetic number, because the mean of its divisors is an integer number (826999).

2^1653997 is an apocalyptic number.

It is an amenable number.

1653997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1653997 is an equidigital number, since it uses as much as digits as its factorization.

1653997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 40.

The square root of 1653997 is about 1286.0781469258. The cubic root of 1653997 is about 118.2619146292.

The spelling of 1653997 in words is "one million, six hundred fifty-three thousand, nine hundred ninety-seven".