724126621 has 2 divisors, whose sum is σ = 724126622. Its totient is φ = 724126620.

The previous prime is 724126583. The next prime is 724126633. The reversal of 724126621 is 126621427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648262521 + 75864100 = 25461^2 + 8710^2 .

It is an emirp because it is prime and its reverse (126621427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724126621 - 2¹¹ = 724124573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724126721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362063310 + 362063311.

It is an arithmetic number, because the mean of its divisors is an integer number (362063311).

Almost surely, 2^724126621 is an apocalyptic number.

It is an amenable number.

724126621 is a deficient number, since it is larger than the sum of its proper divisors (1).

724126621 is an equidigital number, since it uses as much as digits as its factorization.

724126621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 724126621 is about 26909.6009074828. The cubic root of 724126621 is about 897.9900086189.

The spelling of 724126621 in words is "seven hundred twenty-four million, one hundred twenty-six thousand, six hundred twenty-one".