1148727721 has 2 divisors, whose sum is σ = 1148727722. Its totient is φ = 1148727720.

The previous prime is 1148727691. The next prime is 1148727731. The reversal of 1148727721 is 1277278411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1131380496 + 17347225 = 33636^2 + 4165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1148727721 - 2²³ = 1140339113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1148727731) 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, 574363860 + 574363861.

It is an arithmetic number, because the mean of its divisors is an integer number (574363861).

Almost surely, 2^1148727721 is an apocalyptic number.

It is an amenable number.

1148727721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1148727721 is an equidigital number, since it uses as much as digits as its factorization.

1148727721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43904, while the sum is 40.

The square root of 1148727721 is about 33892.8859939663. The cubic root of 1148727721 is about 1047.3030472930.

The spelling of 1148727721 in words is "one billion, one hundred forty-eight million, seven hundred twenty-seven thousand, seven hundred twenty-one".