1138531969 has 2 divisors, whose sum is σ = 1138531970. Its totient is φ = 1138531968.

The previous prime is 1138531937. The next prime is 1138531987. The reversal of 1138531969 is 9691358311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1103568400 + 34963569 = 33220^2 + 5913^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138531969 - 2⁵ = 1138531937 is a prime.

It is a super-2 number, since 2×1138531969² = 2592510088870033922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1138531369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569265984 + 569265985.

It is an arithmetic number, because the mean of its divisors is an integer number (569265985).

Almost surely, 2^1138531969 is an apocalyptic number.

It is an amenable number.

1138531969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138531969 is an equidigital number, since it uses as much as digits as its factorization.

1138531969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 46.

The square root of 1138531969 is about 33742.1393660805. The cubic root of 1138531969 is about 1044.1953220203.

The spelling of 1138531969 in words is "one billion, one hundred thirty-eight million, five hundred thirty-one thousand, nine hundred sixty-nine".