1551859 has 2 divisors, whose sum is σ = 1551860. Its totient is φ = 1551858.

The previous prime is 1551853. The next prime is 1551871. The reversal of 1551859 is 9581551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1551859 - 2⁷ = 1551731 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1551853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775929 + 775930.

It is an arithmetic number, because the mean of its divisors is an integer number (775930).

2^1551859 is an apocalyptic number.

1551859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551859 is an equidigital number, since it uses as much as digits as its factorization.

1551859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 34.

The square root of 1551859 is about 1245.7363284419. The cubic root of 1551859 is about 115.7757011348.

The spelling of 1551859 in words is "one million, five hundred fifty-one thousand, eight hundred fifty-nine".