12781073 has 4 divisors (see below), whose sum is σ = 12813348. Its totient is φ = 12748800.

The previous prime is 12781063. The next prime is 12781081. The reversal of 12781073 is 37018721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37018721 = 1091 ⋅33931.

It can be written as a sum of positive squares in 2 ways, for example, as 8809024 + 3972049 = 2968^2 + 1993^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781073 - 2⁶ = 12781009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12781063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15536 + ... + 16337.

It is an arithmetic number, because the mean of its divisors is an integer number (3203337).

Almost surely, 2^12781073 is an apocalyptic number.

It is an amenable number.

12781073 is a deficient number, since it is larger than the sum of its proper divisors (32275).

12781073 is an equidigital number, since it uses as much as digits as its factorization.

12781073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32274.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 12781073 is about 3575.0626567936. The cubic root of 12781073 is about 233.8060645067.

Adding to 12781073 its reverse (37018721), we get a palindrome (49799794).

The spelling of 12781073 in words is "twelve million, seven hundred eighty-one thousand, seventy-three".