731641 has 4 divisors (see below), whose sum is σ = 756900. Its totient is φ = 706384.

The previous prime is 731639. The next prime is 731651. The reversal of 731641 is 146137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 146137 = 317 ⋅461.

It can be written as a sum of positive squares in 2 ways, for example, as 184041 + 547600 = 429^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 731641 - 2¹ = 731639 is a prime.

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, 12586 + ... + 12643.

It is an arithmetic number, because the mean of its divisors is an integer number (189225).

2⁷³¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

731641 is a deficient number, since it is larger than the sum of its proper divisors (25259).

731641 is a wasteful number, since it uses less digits than its factorization.

731641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25258.

The product of its digits is 504, while the sum is 22.

The square root of 731641 is about 855.3601580621. The cubic root of 731641 is about 90.1085521464.

Subtracting from 731641 its product of digits (504), we obtain a palindrome (731137).

Adding to 731641 its reverse (146137), we get a palindrome (877778).

The spelling of 731641 in words is "seven hundred thirty-one thousand, six hundred forty-one".