721451837 has 2 divisors, whose sum is σ = 721451838. Its totient is φ = 721451836.

The previous prime is 721451791. The next prime is 721451851. The reversal of 721451837 is 738154127.

721451837 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 709103641 + 12348196 = 26629^2 + 3514^2 .

It is a cyclic number.

It is not a de Polignac number, because 721451837 - 2¹⁶ = 721386301 is a prime.

It is a super-2 number, since 2×721451837² = 1040985506221349138, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721451837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721451897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360725918 + 360725919.

It is an arithmetic number, because the mean of its divisors is an integer number (360725919).

Almost surely, 2^721451837 is an apocalyptic number.

It is an amenable number.

721451837 is a deficient number, since it is larger than the sum of its proper divisors (1).

721451837 is an equidigital number, since it uses as much as digits as its factorization.

721451837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The square root of 721451837 is about 26859.8554910483. The cubic root of 721451837 is about 896.8829771770.

The spelling of 721451837 in words is "seven hundred twenty-one million, four hundred fifty-one thousand, eight hundred thirty-seven".