1381149779 has 2 divisors, whose sum is σ = 1381149780. Its totient is φ = 1381149778.

The previous prime is 1381149769. The next prime is 1381149787. The reversal of 1381149779 is 9779411831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1381149779 - 2²⁴ = 1364372563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1381149719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690574889 + 690574890.

It is an arithmetic number, because the mean of its divisors is an integer number (690574890).

Almost surely, 2^1381149779 is an apocalyptic number.

1381149779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381149779 is an equidigital number, since it uses as much as digits as its factorization.

1381149779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 50.

The square root of 1381149779 is about 37163.8235250357. The cubic root of 1381149779 is about 1113.6453963346.

The spelling of 1381149779 in words is "one billion, three hundred eighty-one million, one hundred forty-nine thousand, seven hundred seventy-nine".