1585261 has 2 divisors, whose sum is σ = 1585262. Its totient is φ = 1585260.

The previous prime is 1585253. The next prime is 1585279. The reversal of 1585261 is 1625851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1512900 + 72361 = 1230^2 + 269^2 .

It is an emirp because it is prime and its reverse (1625851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1585261 - 2³ = 1585253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1585201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 792630 + 792631.

It is an arithmetic number, because the mean of its divisors is an integer number (792631).

2^1585261 is an apocalyptic number.

It is an amenable number.

1585261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1585261 is an equidigital number, since it uses as much as digits as its factorization.

1585261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 28.

The square root of 1585261 is about 1259.0714832765. The cubic root of 1585261 is about 116.6004585793.

The spelling of 1585261 in words is "one million, five hundred eighty-five thousand, two hundred sixty-one".