1561607 has 2 divisors, whose sum is σ = 1561608. Its totient is φ = 1561606.

The previous prime is 1561601. The next prime is 1561633. The reversal of 1561607 is 7061651.

It is an a-pointer prime, because the next prime (1561633) can be obtained adding 1561607 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561607 - 2¹⁶ = 1496071 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561601) 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, 780803 + 780804.

It is an arithmetic number, because the mean of its divisors is an integer number (780804).

2^1561607 is an apocalyptic number.

1561607 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561607 is an equidigital number, since it uses as much as digits as its factorization.

1561607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 1561607 is about 1249.6427489487. The cubic root of 1561607 is about 116.0176102872.

The spelling of 1561607 in words is "one million, five hundred sixty-one thousand, six hundred seven".