1278140587 has 2 divisors, whose sum is σ = 1278140588. Its totient is φ = 1278140586.

The previous prime is 1278140581. The next prime is 1278140593. The reversal of 1278140587 is 7850418721.

It is a balanced prime because it is at equal distance from previous prime (1278140581) and next prime (1278140593).

It is a cyclic number.

It is not a de Polignac number, because 1278140587 - 2⁷ = 1278140459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1278140581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639070293 + 639070294.

It is an arithmetic number, because the mean of its divisors is an integer number (639070294).

Almost surely, 2^1278140587 is an apocalyptic number.

1278140587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278140587 is an equidigital number, since it uses as much as digits as its factorization.

1278140587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 1278140587 is about 35751.0921091930. The cubic root of 1278140587 is about 1085.2410394135.

The spelling of 1278140587 in words is "one billion, two hundred seventy-eight million, one hundred forty thousand, five hundred eighty-seven".