731307261 has 4 divisors (see below), whose sum is σ = 975076352. Its totient is φ = 487538172.

The previous prime is 731307251. The next prime is 731307293. The reversal of 731307261 is 162703137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 731307261 - 2¹⁴ = 731290877 is a prime.

It is a super-3 number, since 3×731307261³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731307251) 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, 121884541 + ... + 121884546.

It is an arithmetic number, because the mean of its divisors is an integer number (243769088).

Almost surely, 2^731307261 is an apocalyptic number.

It is an amenable number.

731307261 is a deficient number, since it is larger than the sum of its proper divisors (243769091).

731307261 is a wasteful number, since it uses less digits than its factorization.

731307261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243769090.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 731307261 is about 27042.6933015186. The cubic root of 731307261 is about 900.9484901794.

The spelling of 731307261 in words is "seven hundred thirty-one million, three hundred seven thousand, two hundred sixty-one".