1603531 has 2 divisors, whose sum is σ = 1603532. Its totient is φ = 1603530.

The previous prime is 1603529. The next prime is 1603541. The reversal of 1603531 is 1353061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1603531 - 2¹ = 1603529 is a prime.

It is a super-2 number, since 2×1603531² = 5142623335922, which contains 22 as substring.

Together with 1603529, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1603499 and 1603508.

It is not a weakly prime, because it can be changed into another prime (1603501) 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, 801765 + 801766.

It is an arithmetic number, because the mean of its divisors is an integer number (801766).

2^1603531 is an apocalyptic number.

1603531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603531 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 1603531 = (3013561)₉.

1603531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 1603531 is about 1266.3060451565. The cubic root of 1603531 is about 117.0466855353.

Adding to 1603531 its reverse (1353061), we get a palindrome (2956592).

The spelling of 1603531 in words is "one million, six hundred three thousand, five hundred thirty-one".