1281100493 has 2 divisors, whose sum is σ = 1281100494. Its totient is φ = 1281100492.

The previous prime is 1281100487. The next prime is 1281100511. The reversal of 1281100493 is 3940011821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080962884 + 200137609 = 32878^2 + 14147^2 .

It is a cyclic number.

It is not a de Polignac number, because 1281100493 - 2⁴ = 1281100477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281100423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640550246 + 640550247.

It is an arithmetic number, because the mean of its divisors is an integer number (640550247).

Almost surely, 2^1281100493 is an apocalyptic number.

It is an amenable number.

1281100493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281100493 is an equidigital number, since it uses as much as digits as its factorization.

1281100493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1281100493 is about 35792.4641928996. The cubic root of 1281100493 is about 1086.0781239196.

The spelling of 1281100493 in words is "one billion, two hundred eighty-one million, one hundred thousand, four hundred ninety-three".