724040281 has 2 divisors, whose sum is σ = 724040282. Its totient is φ = 724040280.

The previous prime is 724040269. The next prime is 724040287. The reversal of 724040281 is 182040427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 502477056 + 221563225 = 22416^2 + 14885^2 .

It is an emirp because it is prime and its reverse (182040427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724040281 - 2¹⁵ = 724007513 is a prime.

It is a super-2 number, since 2×724040281² = 1048468657021117922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (724040287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362020140 + 362020141.

It is an arithmetic number, because the mean of its divisors is an integer number (362020141).

Almost surely, 2^724040281 is an apocalyptic number.

It is an amenable number.

724040281 is a deficient number, since it is larger than the sum of its proper divisors (1).

724040281 is an equidigital number, since it uses as much as digits as its factorization.

724040281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 724040281 is about 26907.9965995241. The cubic root of 724040281 is about 897.9543170991.

The spelling of 724040281 in words is "seven hundred twenty-four million, forty thousand, two hundred eighty-one".