1013553 has 24 divisors (see below), whose sum is σ = 1569568. Its totient is φ = 653184.

The previous prime is 1013533. The next prime is 1013563. The reversal of 1013553 is 3553101.

It is a happy number.

It is not a de Polignac number, because 1013553 - 2⁹ = 1013041 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013503) 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 in 23 ways as a sum of consecutive naturals, for example, 10401 + ... + 10497.

2^1013553 is an apocalyptic number.

It is an amenable number.

1013553 is a deficient number, since it is larger than the sum of its proper divisors (556015).

1013553 is an frugal number, since it uses more digits than its factorization.

1013553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

The square root of 1013553 is about 1006.7536938100. The cubic root of 1013553 is about 100.4497409651.

Adding to 1013553 its reverse (3553101), we get a palindrome (4566654).

It can be divided in two parts, 101 and 3553, that multiplied together give a palindrome (358853).

The spelling of 1013553 in words is "one million, thirteen thousand, five hundred fifty-three".