1855613 has 2 divisors, whose sum is σ = 1855614. Its totient is φ = 1855612.

The previous prime is 1855603. The next prime is 1855621. The reversal of 1855613 is 3165581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1844164 + 11449 = 1358^2 + 107^2 .

It is an emirp because it is prime and its reverse (3165581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1855613 - 2⁶ = 1855549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855603) 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, 927806 + 927807.

It is an arithmetic number, because the mean of its divisors is an integer number (927807).

2^1855613 is an apocalyptic number.

It is an amenable number.

1855613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855613 is an equidigital number, since it uses as much as digits as its factorization.

1855613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 1855613 is about 1362.2088679788. The cubic root of 1855613 is about 122.8841308632.

The spelling of 1855613 in words is "one million, eight hundred fifty-five thousand, six hundred thirteen".