1285983421 has 2 divisors, whose sum is σ = 1285983422. Its totient is φ = 1285983420.

The previous prime is 1285983407. The next prime is 1285983427. The reversal of 1285983421 is 1243895821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805935321 + 480048100 = 28389^2 + 21910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285983421 - 2¹¹ = 1285981373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285983427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642991710 + 642991711.

It is an arithmetic number, because the mean of its divisors is an integer number (642991711).

Almost surely, 2^1285983421 is an apocalyptic number.

It is an amenable number.

1285983421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285983421 is an equidigital number, since it uses as much as digits as its factorization.

1285983421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 43.

The square root of 1285983421 is about 35860.6109959103. The cubic root of 1285983421 is about 1087.4562405610.

The spelling of 1285983421 in words is "one billion, two hundred eighty-five million, nine hundred eighty-three thousand, four hundred twenty-one".