1381149787 has 2 divisors, whose sum is σ = 1381149788. Its totient is φ = 1381149786.

The previous prime is 1381149779. The next prime is 1381149827. The reversal of 1381149787 is 7879411831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1381149787 - 2³ = 1381149779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1381149787.

It is not a weakly prime, because it can be changed into another prime (1381149487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690574893 + 690574894.

It is an arithmetic number, because the mean of its divisors is an integer number (690574894).

Almost surely, 2^1381149787 is an apocalyptic number.

1381149787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381149787 is an equidigital number, since it uses as much as digits as its factorization.

1381149787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 49.

The square root of 1381149787 is about 37163.8236326673. The cubic root of 1381149787 is about 1113.6453984848.

The spelling of 1381149787 in words is "one billion, three hundred eighty-one million, one hundred forty-nine thousand, seven hundred eighty-seven".