721051 has 2 divisors, whose sum is σ = 721052. Its totient is φ = 721050.

The previous prime is 721043. The next prime is 721057. The reversal of 721051 is 150127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721051 - 2³ = 721043 is a prime.

It is not a weakly prime, because it can be changed into another prime (721057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360525 + 360526.

It is an arithmetic number, because the mean of its divisors is an integer number (360526).

2⁷²¹⁰⁵¹ is an apocalyptic number.

721051 is a deficient number, since it is larger than the sum of its proper divisors (1).

721051 is an equidigital number, since it uses as much as digits as its factorization.

721051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 721051 is about 849.1472192735. The cubic root of 721051 is about 89.6716844358.

Adding to 721051 its reverse (150127), we get a palindrome (871178).

The spelling of 721051 in words is "seven hundred twenty-one thousand, fifty-one".