1139431375721 has 2 divisors, whose sum is σ = 1139431375722. Its totient is φ = 1139431375720.

The previous prime is 1139431375651. The next prime is 1139431375769. The reversal of 1139431375721 is 1275731349311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888419353600 + 251012022121 = 942560^2 + 501011^2 .

It is an emirp because it is prime and its reverse (1275731349311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1139431375721 - 2³⁸ = 864553468777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1139431375781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569715687860 + 569715687861.

It is an arithmetic number, because the mean of its divisors is an integer number (569715687861).

Almost surely, 2^{1139431375721} is an apocalyptic number.

It is an amenable number.

1139431375721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139431375721 is an equidigital number, since it uses as much as digits as its factorization.

1139431375721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 47.

The spelling of 1139431375721 in words is "one trillion, one hundred thirty-nine billion, four hundred thirty-one million, three hundred seventy-five thousand, seven hundred twenty-one".