724074521 has 2 divisors, whose sum is σ = 724074522. Its totient is φ = 724074520.

The previous prime is 724074503. The next prime is 724074607. The reversal of 724074521 is 125470427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631818496 + 92256025 = 25136^2 + 9605^2 .

It is an emirp because it is prime and its reverse (125470427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-724074521 is a prime.

It is a super-2 number, since 2×724074521² = 1048567823922758882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (724073521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362037260 + 362037261.

It is an arithmetic number, because the mean of its divisors is an integer number (362037261).

Almost surely, 2^724074521 is an apocalyptic number.

It is an amenable number.

724074521 is a deficient number, since it is larger than the sum of its proper divisors (1).

724074521 is an equidigital number, since it uses as much as digits as its factorization.

724074521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 724074521 is about 26908.6328340925. The cubic root of 724074521 is about 897.9684716850.

The spelling of 724074521 in words is "seven hundred twenty-four million, seventy-four thousand, five hundred twenty-one".