1648697 has 2 divisors, whose sum is σ = 1648698. Its totient is φ = 1648696.

The previous prime is 1648613. The next prime is 1648723. The reversal of 1648697 is 7968461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207801 + 440896 = 1099^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648697 - 2⁸ = 1648441 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1608697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824348 + 824349.

It is an arithmetic number, because the mean of its divisors is an integer number (824349).

2^1648697 is an apocalyptic number.

It is an amenable number.

1648697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648697 is an equidigital number, since it uses as much as digits as its factorization.

1648697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 1648697 is about 1284.0159656328. The cubic root of 1648697 is about 118.1354615932.

Subtracting from 1648697 its sum of digits (41), we obtain a square (1648656 = 1284²).

The spelling of 1648697 in words is "one million, six hundred forty-eight thousand, six hundred ninety-seven".