1276540493 has 2 divisors, whose sum is σ = 1276540494. Its totient is φ = 1276540492.

The previous prime is 1276540487. The next prime is 1276540543. The reversal of 1276540493 is 3940456721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084911844 + 191628649 = 32938^2 + 13843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276540493 - 2¹² = 1276536397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1276540493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276540193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638270246 + 638270247.

It is an arithmetic number, because the mean of its divisors is an integer number (638270247).

Almost surely, 2^1276540493 is an apocalyptic number.

It is an amenable number.

1276540493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276540493 is an equidigital number, since it uses as much as digits as its factorization.

1276540493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1276540493 is about 35728.7068475757. The cubic root of 1276540493 is about 1084.7879821026.

The spelling of 1276540493 in words is "one billion, two hundred seventy-six million, five hundred forty thousand, four hundred ninety-three".