731356261 has 4 divisors (see below), whose sum is σ = 731487724. Its totient is φ = 731224800.

The previous prime is 731356259. The next prime is 731356313. The reversal of 731356261 is 162653137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162653137 = 131 ⋅1241627.

It can be written as a sum of positive squares in 2 ways, for example, as 379080900 + 352275361 = 19470^2 + 18769^2 .

It is a cyclic number.

It is not a de Polignac number, because 731356261 - 2¹ = 731356259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731356211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57000 + ... + 68641.

It is an arithmetic number, because the mean of its divisors is an integer number (182871931).

Almost surely, 2^731356261 is an apocalyptic number.

It is an amenable number.

731356261 is a deficient number, since it is larger than the sum of its proper divisors (131463).

731356261 is a wasteful number, since it uses less digits than its factorization.

731356261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131462.

The product of its digits is 22680, while the sum is 34.

The square root of 731356261 is about 27043.5992611930. The cubic root of 731356261 is about 900.9686119041.

The spelling of 731356261 in words is "seven hundred thirty-one million, three hundred fifty-six thousand, two hundred sixty-one".