12540961 has 2 divisors, whose sum is σ = 12540962. Its totient is φ = 12540960.

The previous prime is 12540953. The next prime is 12540967. The reversal of 12540961 is 16904521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 844561 = 3420^2 + 919^2 .

It is an emirp because it is prime and its reverse (16904521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12540961 - 2³ = 12540953 is a prime.

It is not a weakly prime, because it can be changed into another prime (12540967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270480 + 6270481.

It is an arithmetic number, because the mean of its divisors is an integer number (6270481).

Almost surely, 2^12540961 is an apocalyptic number.

It is an amenable number.

12540961 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540961 is an equidigital number, since it uses as much as digits as its factorization.

12540961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 12540961 is about 3541.3219283200. The cubic root of 12540961 is about 232.3326641155.

The spelling of 12540961 in words is "twelve million, five hundred forty thousand, nine hundred sixty-one".