1139146721 has 2 divisors, whose sum is σ = 1139146722. Its totient is φ = 1139146720.

The previous prime is 1139146667. The next prime is 1139146733. The reversal of 1139146721 is 1276419311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1097994496 + 41152225 = 33136^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1139146721 - 2¹⁰ = 1139145697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1139146321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569573360 + 569573361.

It is an arithmetic number, because the mean of its divisors is an integer number (569573361).

Almost surely, 2^1139146721 is an apocalyptic number.

It is an amenable number.

1139146721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139146721 is an equidigital number, since it uses as much as digits as its factorization.

1139146721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 1139146721 is about 33751.2476954556. The cubic root of 1139146721 is about 1044.3832264678.

The spelling of 1139146721 in words is "one billion, one hundred thirty-nine million, one hundred forty-six thousand, seven hundred twenty-one".