1391518129 has 2 divisors, whose sum is σ = 1391518130. Its totient is φ = 1391518128.

The previous prime is 1391518103. The next prime is 1391518159. The reversal of 1391518129 is 9218151931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 775733904 + 615784225 = 27852^2 + 24815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391518129 - 2⁵ = 1391518097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1391518091 and 1391518100.

It is not a weakly prime, because it can be changed into another prime (1391518159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695759064 + 695759065.

It is an arithmetic number, because the mean of its divisors is an integer number (695759065).

Almost surely, 2^1391518129 is an apocalyptic number.

It is an amenable number.

1391518129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391518129 is an equidigital number, since it uses as much as digits as its factorization.

1391518129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 40.

The square root of 1391518129 is about 37303.0579041451. The cubic root of 1391518129 is about 1116.4251796609.

The spelling of 1391518129 in words is "one billion, three hundred ninety-one million, five hundred eighteen thousand, one hundred twenty-nine".