731613 has 4 divisors (see below), whose sum is σ = 975488. Its totient is φ = 487740.

The previous prime is 731611. The next prime is 731623. The reversal of 731613 is 316137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316137 = 3 ⋅105379.

It is not a de Polignac number, because 731613 - 2¹ = 731611 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 731613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731611) 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, 121933 + ... + 121938.

It is an arithmetic number, because the mean of its divisors is an integer number (243872).

2⁷³¹⁶¹³ is an apocalyptic number.

It is an amenable number.

731613 is a deficient number, since it is larger than the sum of its proper divisors (243875).

731613 is a wasteful number, since it uses less digits than its factorization.

731613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243874.

The product of its digits is 378, while the sum is 21.

The square root of 731613 is about 855.3437905310. The cubic root of 731613 is about 90.1074026429.

The spelling of 731613 in words is "seven hundred thirty-one thousand, six hundred thirteen".