730531 has 4 divisors (see below), whose sum is σ = 769000. Its totient is φ = 692064.

The previous prime is 730487. The next prime is 730537. The reversal of 730531 is 135037.

730531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-730531 is a prime.

It is a super-2 number, since 2×730531² = 1067351083922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 38449 = 730531 / (7 + 3 + 0 + 5 + 3 + 1).

It is a Duffinian number.

730531 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 730499 and 730508.

It is not an unprimeable number, because it can be changed into a prime (730537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19206 + ... + 19243.

It is an arithmetic number, because the mean of its divisors is an integer number (192250).

2⁷³⁰⁵³¹ is an apocalyptic number.

730531 is a deficient number, since it is larger than the sum of its proper divisors (38469).

730531 is a wasteful number, since it uses less digits than its factorization.

730531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38468.

The product of its (nonzero) digits is 315, while the sum is 19.

The square root of 730531 is about 854.7110622895. The cubic root of 730531 is about 90.0629600609.

Adding to 730531 its reverse (135037), we get a palindrome (865568).

The spelling of 730531 in words is "seven hundred thirty thousand, five hundred thirty-one".