1426655821 has 2 divisors, whose sum is σ = 1426655822. Its totient is φ = 1426655820.

The previous prime is 1426655809. The next prime is 1426655837. The reversal of 1426655821 is 1285566241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1314062500 + 112593321 = 36250^2 + 10611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1426655821 - 2¹¹ = 1426653773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1426655851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713327910 + 713327911.

It is an arithmetic number, because the mean of its divisors is an integer number (713327911).

Almost surely, 2^1426655821 is an apocalyptic number.

It is an amenable number.

1426655821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1426655821 is an equidigital number, since it uses as much as digits as its factorization.

1426655821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 40.

The square root of 1426655821 is about 37771.0976938717. The cubic root of 1426655821 is about 1125.7442505075.

The spelling of 1426655821 in words is "one billion, four hundred twenty-six million, six hundred fifty-five thousand, eight hundred twenty-one".