1391118049 has 2 divisors, whose sum is σ = 1391118050. Its totient is φ = 1391118048.

The previous prime is 1391118037. The next prime is 1391118073. The reversal of 1391118049 is 9408111931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905709025 + 485409024 = 30095^2 + 22032^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391118049 - 2⁷ = 1391117921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1391117999 and 1391118017.

It is not a weakly prime, because it can be changed into another prime (1391118089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695559024 + 695559025.

It is an arithmetic number, because the mean of its divisors is an integer number (695559025).

Almost surely, 2^1391118049 is an apocalyptic number.

It is an amenable number.

1391118049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391118049 is an equidigital number, since it uses as much as digits as its factorization.

1391118049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 1391118049 is about 37297.6949555867. The cubic root of 1391118049 is about 1116.3181737009.

The spelling of 1391118049 in words is "one billion, three hundred ninety-one million, one hundred eighteen thousand, forty-nine".