1603081 has 2 divisors, whose sum is σ = 1603082. Its totient is φ = 1603080.

The previous prime is 1603079. The next prime is 1603093. The reversal of 1603081 is 1803061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1392400 + 210681 = 1180^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 1603081 - 2¹ = 1603079 is a prime.

It is a super-2 number, since 2×1603081² = 5139737385122, which contains 22 as substring.

Together with 1603079, it forms a pair of twin primes.

1603081 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1603051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801540 + 801541.

It is an arithmetic number, because the mean of its divisors is an integer number (801541).

2^1603081 is an apocalyptic number.

It is an amenable number.

1603081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603081 is an equidigital number, since it uses as much as digits as its factorization.

1603081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1603081 is about 1266.1283505238. The cubic root of 1603081 is about 117.0357355472.

The spelling of 1603081 in words is "one million, six hundred three thousand, eighty-one".