1298881643 has 2 divisors, whose sum is σ = 1298881644. Its totient is φ = 1298881642.

The previous prime is 1298881561. The next prime is 1298881657. The reversal of 1298881643 is 3461888921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1298881643 - 2¹⁶ = 1298816107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1298881591 and 1298881600.

It is not a weakly prime, because it can be changed into another prime (1298881673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649440821 + 649440822.

It is an arithmetic number, because the mean of its divisors is an integer number (649440822).

Almost surely, 2^1298881643 is an apocalyptic number.

1298881643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298881643 is an equidigital number, since it uses as much as digits as its factorization.

1298881643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The square root of 1298881643 is about 36040.0005965594. Note that the first 3 decimals coincide. The cubic root of 1298881643 is about 1091.0798274084.

The spelling of 1298881643 in words is "one billion, two hundred ninety-eight million, eight hundred eighty-one thousand, six hundred forty-three".