1855013 has 2 divisors, whose sum is σ = 1855014. Its totient is φ = 1855012.

The previous prime is 1855001. The next prime is 1855031. The reversal of 1855013 is 3105581.

Together with next prime (1855031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1723969 + 131044 = 1313^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855013 - 2⁴ = 1854997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1855013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927506 + 927507.

It is an arithmetic number, because the mean of its divisors is an integer number (927507).

2^1855013 is an apocalyptic number.

It is an amenable number.

1855013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855013 is an equidigital number, since it uses as much as digits as its factorization.

1855013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1855013 is about 1361.9886196294. The cubic root of 1855013 is about 122.8708848493.

The spelling of 1855013 in words is "one million, eight hundred fifty-five thousand, thirteen".