12778537 has 2 divisors, whose sum is σ = 12778538. Its totient is φ = 12778536.

The previous prime is 12778523. The next prime is 12778553. The reversal of 12778537 is 73587721.

12778537 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12524521 + 254016 = 3539^2 + 504^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12778537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12778537.

It is not a weakly prime, because it can be changed into another prime (12778517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389268 + 6389269.

It is an arithmetic number, because the mean of its divisors is an integer number (6389269).

Almost surely, 2^12778537 is an apocalyptic number.

It is an amenable number.

12778537 is a deficient number, since it is larger than the sum of its proper divisors (1).

12778537 is an equidigital number, since it uses as much as digits as its factorization.

12778537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 40.

The square root of 12778537 is about 3574.7079600997. The cubic root of 12778537 is about 233.7905996758.

The spelling of 12778537 in words is "twelve million, seven hundred seventy-eight thousand, five hundred thirty-seven".