731245 has 4 divisors (see below), whose sum is σ = 877500. Its totient is φ = 584992.

The previous prime is 731243. The next prime is 731249. The reversal of 731245 is 542137.

731245 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 can be written as a sum of positive squares in 2 ways, for example, as 514089 + 217156 = 717^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 731245 - 2¹ = 731243 is a prime.

It is a super-3 number, since 3×731245³ = 1173032333953593375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731243) 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, 73120 + ... + 73129.

It is an arithmetic number, because the mean of its divisors is an integer number (219375).

2⁷³¹²⁴⁵ is an apocalyptic number.

It is an amenable number.

731245 is a deficient number, since it is larger than the sum of its proper divisors (146255).

731245 is a wasteful number, since it uses less digits than its factorization.

731245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146254.

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

The square root of 731245 is about 855.1286452926. The cubic root of 731245 is about 90.0922921562.

The spelling of 731245 in words is "seven hundred thirty-one thousand, two hundred forty-five".