1285778587 has 2 divisors, whose sum is σ = 1285778588. Its totient is φ = 1285778586.

The previous prime is 1285778567. The next prime is 1285778633. The reversal of 1285778587 is 7858775821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1285778587 - 2²⁷ = 1151560859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285778567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642889293 + 642889294.

It is an arithmetic number, because the mean of its divisors is an integer number (642889294).

Almost surely, 2^1285778587 is an apocalyptic number.

1285778587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285778587 is an equidigital number, since it uses as much as digits as its factorization.

1285778587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8780800, while the sum is 58.

The square root of 1285778587 is about 35857.7549074116. The cubic root of 1285778587 is about 1087.3985000967.

The spelling of 1285778587 in words is "one billion, two hundred eighty-five million, seven hundred seventy-eight thousand, five hundred eighty-seven".