1203581 has 2 divisors, whose sum is σ = 1203582. Its totient is φ = 1203580.

The previous prime is 1203571. The next prime is 1203607. The reversal of 1203581 is 1853021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 111556 = 1045^2 + 334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1203581 is a prime.

It is a super-2 number, since 2×1203581² = 2897214447122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1203571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601790 + 601791.

It is an arithmetic number, because the mean of its divisors is an integer number (601791).

2^1203581 is an apocalyptic number.

It is an amenable number.

1203581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1203581 is an equidigital number, since it uses as much as digits as its factorization.

1203581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1203581 is about 1097.0783928234. The cubic root of 1203581 is about 106.3714569545.

The spelling of 1203581 in words is "one million, two hundred three thousand, five hundred eighty-one".