731145 has 16 divisors (see below), whose sum is σ = 1186560. Its totient is φ = 384384.

The previous prime is 731141. The next prime is 731173. The reversal of 731145 is 541137.

It is not a de Polignac number, because 731145 - 2² = 731141 is a prime.

It is a super-2 number, since 2×731145² = 1069146022050, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (731141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877 + ... + 1493.

It is an arithmetic number, because the mean of its divisors is an integer number (74160).

2⁷³¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

731145 is a deficient number, since it is larger than the sum of its proper divisors (455415).

731145 is a wasteful number, since it uses less digits than its factorization.

731145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704.

The product of its digits is 420, while the sum is 21.

The square root of 731145 is about 855.0701725590. The cubic root of 731145 is about 90.0881851698.

The spelling of 731145 in words is "seven hundred thirty-one thousand, one hundred forty-five".