1140728761 has 2 divisors, whose sum is σ = 1140728762. Its totient is φ = 1140728760.

The previous prime is 1140728711. The next prime is 1140728767. The reversal of 1140728761 is 1678270411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 826907536 + 313821225 = 28756^2 + 17715^2 .

It is an emirp because it is prime and its reverse (1678270411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1140728761 - 2²¹ = 1138631609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1140728761.

It is not a weakly prime, because it can be changed into another prime (1140728767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 570364380 + 570364381.

It is an arithmetic number, because the mean of its divisors is an integer number (570364381).

Almost surely, 2^1140728761 is an apocalyptic number.

It is an amenable number.

1140728761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1140728761 is an equidigital number, since it uses as much as digits as its factorization.

1140728761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 1140728761 is about 33774.6763270945. The cubic root of 1140728761 is about 1044.8664805028.

The spelling of 1140728761 in words is "one billion, one hundred forty million, seven hundred twenty-eight thousand, seven hundred sixty-one".