1281202393 has 2 divisors, whose sum is σ = 1281202394. Its totient is φ = 1281202392.

The previous prime is 1281202387. The next prime is 1281202423. The reversal of 1281202393 is 3932021821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998054464 + 283147929 = 31592^2 + 16827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281202393 - 2⁹ = 1281201881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1281202303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640601196 + 640601197.

It is an arithmetic number, because the mean of its divisors is an integer number (640601197).

Almost surely, 2^1281202393 is an apocalyptic number.

It is an amenable number.

1281202393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281202393 is an equidigital number, since it uses as much as digits as its factorization.

1281202393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1281202393 is about 35793.8876485916. The cubic root of 1281202393 is about 1086.1069190654.

The spelling of 1281202393 in words is "one billion, two hundred eighty-one million, two hundred two thousand, three hundred ninety-three".