426698557 has 2 divisors, whose sum is σ = 426698558. Its totient is φ = 426698556.

The previous prime is 426698549. The next prime is 426698563. The reversal of 426698557 is 755896624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412455481 + 14243076 = 20309^2 + 3774^2 .

It is a cyclic number.

It is not a de Polignac number, because 426698557 - 2³ = 426698549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426698567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213349278 + 213349279.

It is an arithmetic number, because the mean of its divisors is an integer number (213349279).

Almost surely, 2^426698557 is an apocalyptic number.

It is an amenable number.

426698557 is a deficient number, since it is larger than the sum of its proper divisors (1).

426698557 is an equidigital number, since it uses as much as digits as its factorization.

426698557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 52.

The square root of 426698557 is about 20656.6831074110. The cubic root of 426698557 is about 752.8475788579.

The spelling of 426698557 in words is "four hundred twenty-six million, six hundred ninety-eight thousand, five hundred fifty-seven".