1139434561 has 2 divisors, whose sum is σ = 1139434562. Its totient is φ = 1139434560.

The previous prime is 1139434529. The next prime is 1139434577. The reversal of 1139434561 is 1654349311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1107624961 + 31809600 = 33281^2 + 5640^2 .

It is an emirp because it is prime and its reverse (1654349311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1139434561 - 2⁵ = 1139434529 is a prime.

It is a super-2 number, since 2×1139434561² = 2596622237602525442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1139434561.

It is not a weakly prime, because it can be changed into another prime (1139434501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569717280 + 569717281.

It is an arithmetic number, because the mean of its divisors is an integer number (569717281).

Almost surely, 2^1139434561 is an apocalyptic number.

It is an amenable number.

1139434561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139434561 is an equidigital number, since it uses as much as digits as its factorization.

1139434561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 1139434561 is about 33755.5115647801. The cubic root of 1139434561 is about 1044.4711841020.

The spelling of 1139434561 in words is "one billion, one hundred thirty-nine million, four hundred thirty-four thousand, five hundred sixty-one".