724577261 has 2 divisors, whose sum is σ = 724577262. Its totient is φ = 724577260.

The previous prime is 724577221. The next prime is 724577263. The reversal of 724577261 is 162775427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621554761 + 103022500 = 24931^2 + 10150^2 .

It is an emirp because it is prime and its reverse (162775427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724577261 - 2⁶ = 724577197 is a prime.

Together with 724577263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724577263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362288630 + 362288631.

It is an arithmetic number, because the mean of its divisors is an integer number (362288631).

Almost surely, 2^724577261 is an apocalyptic number.

It is an amenable number.

724577261 is a deficient number, since it is larger than the sum of its proper divisors (1).

724577261 is an equidigital number, since it uses as much as digits as its factorization.

724577261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164640, while the sum is 41.

The square root of 724577261 is about 26917.9728248618. The cubic root of 724577261 is about 898.1762496665.

The spelling of 724577261 in words is "seven hundred twenty-four million, five hundred seventy-seven thousand, two hundred sixty-one".