724531 has 2 divisors, whose sum is σ = 724532. Its totient is φ = 724530.

The previous prime is 724519. The next prime is 724547. The reversal of 724531 is 135427.

724531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (135427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724531 - 2⁵ = 724499 is a prime.

It is a super-2 number, since 2×724531² = 1049890339922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (724331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362265 + 362266.

It is an arithmetic number, because the mean of its divisors is an integer number (362266).

2⁷²⁴⁵³¹ is an apocalyptic number.

724531 is a deficient number, since it is larger than the sum of its proper divisors (1).

724531 is an equidigital number, since it uses as much as digits as its factorization.

724531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 22.

The square root of 724531 is about 851.1938674591. The cubic root of 724531 is about 89.8157134421.

Adding to 724531 its reverse (135427), we get a palindrome (859958).

The spelling of 724531 in words is "seven hundred twenty-four thousand, five hundred thirty-one".