1651609 has 2 divisors, whose sum is σ = 1651610. Its totient is φ = 1651608.

The previous prime is 1651597. The next prime is 1651621. The reversal of 1651609 is 9061561.

It is a balanced prime because it is at equal distance from previous prime (1651597) and next prime (1651621).

It can be written as a sum of positive squares in only one way, i.e., 1587600 + 64009 = 1260^2 + 253^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651609 - 2¹⁷ = 1520537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825804 + 825805.

It is an arithmetic number, because the mean of its divisors is an integer number (825805).

2^1651609 is an apocalyptic number.

It is an amenable number.

1651609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651609 is an equidigital number, since it uses as much as digits as its factorization.

1651609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1651609 is about 1285.1494076566. The cubic root of 1651609 is about 118.2049726732.

The spelling of 1651609 in words is "one million, six hundred fifty-one thousand, six hundred nine".