1281993093 has 24 divisors (see below), whose sum is σ = 1863779736. Its totient is φ = 849139200.

The previous prime is 1281993073. The next prime is 1281993107. The reversal of 1281993093 is 3903991821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30107169 + 1251885924 = 5487^2 + 35382^2 .

It is not a de Polignac number, because 1281993093 - 2²⁴ = 1265215877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281993073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1367721 + ... + 1368657.

It is an arithmetic number, because the mean of its divisors is an integer number (77657489).

Almost surely, 2^1281993093 is an apocalyptic number.

It is an amenable number.

1281993093 is a deficient number, since it is larger than the sum of its proper divisors (581786643).

1281993093 is a wasteful number, since it uses less digits than its factorization.

1281993093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765 (or 1762 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 1281993093 is about 35804.9311268713. The cubic root of 1281993093 is about 1086.3303050916.

The spelling of 1281993093 in words is "one billion, two hundred eighty-one million, nine hundred ninety-three thousand, ninety-three".