12540811 has 2 divisors, whose sum is σ = 12540812. Its totient is φ = 12540810.

The previous prime is 12540809. The next prime is 12540877. The reversal of 12540811 is 11804521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12540811 - 2¹ = 12540809 is a prime.

Together with 12540809, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12540881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270405 + 6270406.

It is an arithmetic number, because the mean of its divisors is an integer number (6270406).

Almost surely, 2^12540811 is an apocalyptic number.

12540811 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540811 is an equidigital number, since it uses as much as digits as its factorization.

12540811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 12540811 is about 3541.3007497246. The cubic root of 12540811 is about 232.3317378165.

The spelling of 12540811 in words is "twelve million, five hundred forty thousand, eight hundred eleven".