1656607 has 2 divisors, whose sum is σ = 1656608. Its totient is φ = 1656606.

The previous prime is 1656593. The next prime is 1656617. The reversal of 1656607 is 7066561.

It is a strong prime.

It is an emirp because it is prime and its reverse (7066561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1656607 is a prime.

1656607 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1656617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828303 + 828304.

It is an arithmetic number, because the mean of its divisors is an integer number (828304).

2^1656607 is an apocalyptic number.

1656607 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656607 is an equidigital number, since it uses as much as digits as its factorization.

1656607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1656607 is about 1287.0924597712. The cubic root of 1656607 is about 118.3240875317.

The spelling of 1656607 in words is "one million, six hundred fifty-six thousand, six hundred seven".