426312781 has 2 divisors, whose sum is σ = 426312782. Its totient is φ = 426312780.

The previous prime is 426312763. The next prime is 426312827. The reversal of 426312781 is 187213624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420865225 + 5447556 = 20515^2 + 2334^2 .

It is a cyclic number.

It is not a de Polignac number, because 426312781 - 2¹³ = 426304589 is a prime.

It is a super-2 number, since 2×426312781² = 363485174487907922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426312181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213156390 + 213156391.

It is an arithmetic number, because the mean of its divisors is an integer number (213156391).

Almost surely, 2^426312781 is an apocalyptic number.

It is an amenable number.

426312781 is a deficient number, since it is larger than the sum of its proper divisors (1).

426312781 is an equidigital number, since it uses as much as digits as its factorization.

426312781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 426312781 is about 20647.3431947067. The cubic root of 426312781 is about 752.6206285575.

The spelling of 426312781 in words is "four hundred twenty-six million, three hundred twelve thousand, seven hundred eighty-one".