1285381 has 2 divisors, whose sum is σ = 1285382. Its totient is φ = 1285380.

The previous prime is 1285351. The next prime is 1285393. The reversal of 1285381 is 1835821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069156 + 216225 = 1034^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285381 - 2¹¹ = 1283333 is a prime.

It is a super-2 number, since 2×1285381² = 3304408630322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642690 + 642691.

It is an arithmetic number, because the mean of its divisors is an integer number (642691).

2^1285381 is an apocalyptic number.

It is an amenable number.

1285381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285381 is an equidigital number, since it uses as much as digits as its factorization.

1285381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 28.

The square root of 1285381 is about 1133.7464443164. The cubic root of 1285381 is about 108.7286407164.

The spelling of 1285381 in words is "one million, two hundred eighty-five thousand, three hundred eighty-one".