731993261 has 2 divisors, whose sum is σ = 731993262. Its totient is φ = 731993260.

The previous prime is 731993209. The next prime is 731993267. The reversal of 731993261 is 162399137.

731993261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647702500 + 84290761 = 25450^2 + 9181^2 .

It is a cyclic number.

It is not a de Polignac number, because 731993261 - 2²⁶ = 664884397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731993267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365996630 + 365996631.

It is an arithmetic number, because the mean of its divisors is an integer number (365996631).

Almost surely, 2^731993261 is an apocalyptic number.

It is an amenable number.

731993261 is a deficient number, since it is larger than the sum of its proper divisors (1).

731993261 is an equidigital number, since it uses as much as digits as its factorization.

731993261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 41.

The square root of 731993261 is about 27055.3739763471. The cubic root of 731993261 is about 901.2301125765.

The spelling of 731993261 in words is "seven hundred thirty-one million, nine hundred ninety-three thousand, two hundred sixty-one".