913531 has 4 divisors (see below), whose sum is σ = 917064. Its totient is φ = 910000.

The previous prime is 913513. The next prime is 913571. The reversal of 913531 is 135319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 913531 - 2¹³ = 905339 is a prime.

It is a super-2 number, since 2×913531² = 1669077775922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

913531 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (913571) 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 3 ways as a sum of consecutive naturals, for example, 1345 + ... + 1906.

It is an arithmetic number, because the mean of its divisors is an integer number (229266).

2⁹¹³⁵³¹ is an apocalyptic number.

913531 is a deficient number, since it is larger than the sum of its proper divisors (3533).

913531 is a wasteful number, since it uses less digits than its factorization.

913531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532.

The product of its digits is 405, while the sum is 22.

The square root of 913531 is about 955.7881564447. The cubic root of 913531 is about 97.0303869087.

Adding to 913531 its product of digits (405), we get a square (913936 = 956²).

It can be divided in two parts, 913 and 531, that added together give a square (1444 = 38²).

The spelling of 913531 in words is "nine hundred thirteen thousand, five hundred thirty-one".