426722521 has 2 divisors, whose sum is σ = 426722522. Its totient is φ = 426722520.

The previous prime is 426722509. The next prime is 426722537. The reversal of 426722521 is 125227624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421727296 + 4995225 = 20536^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 426722521 - 2⁷ = 426722393 is a prime.

It is equal to p_22683226 and since 426722521 and 22683226 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (426722551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213361260 + 213361261.

It is an arithmetic number, because the mean of its divisors is an integer number (213361261).

Almost surely, 2^426722521 is an apocalyptic number.

It is an amenable number.

426722521 is a deficient number, since it is larger than the sum of its proper divisors (1).

426722521 is an equidigital number, since it uses as much as digits as its factorization.

426722521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 31.

The square root of 426722521 is about 20657.2631536707. The cubic root of 426722521 is about 752.8616722590.

The spelling of 426722521 in words is "four hundred twenty-six million, seven hundred twenty-two thousand, five hundred twenty-one".