1203531 has 16 divisors (see below), whose sum is σ = 1849344. Its totient is φ = 681984.

The previous prime is 1203509. The next prime is 1203533. The reversal of 1203531 is 1353021.

It is a happy number.

It is not a de Polignac number, because 1203531 - 2⁶ = 1203467 is a prime.

It is a super-2 number, since 2×1203531² = 2896973735922, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1203531.

It is not an unprimeable number, because it can be changed into a prime (1203533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4555 + ... + 4811.

It is an arithmetic number, because the mean of its divisors is an integer number (115584).

2^1203531 is an apocalyptic number.

1203531 is a deficient number, since it is larger than the sum of its proper divisors (645813).

1203531 is a wasteful number, since it uses less digits than its factorization.

1203531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 1203531 is about 1097.0556047895. The cubic root of 1203531 is about 106.3699839483.

Adding to 1203531 its reverse (1353021), we get a palindrome (2556552).

The spelling of 1203531 in words is "one million, two hundred three thousand, five hundred thirty-one".