1154643521 has 2 divisors, whose sum is σ = 1154643522. Its totient is φ = 1154643520.

The previous prime is 1154643491. The next prime is 1154643551. The reversal of 1154643521 is 1253464511.

It is a balanced prime because it is at equal distance from previous prime (1154643491) and next prime (1154643551).

It can be written as a sum of positive squares in only one way, i.e., 1073283121 + 81360400 = 32761^2 + 9020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1154643521 - 2¹⁴ = 1154627137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1154643551) 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, 577321760 + 577321761.

It is an arithmetic number, because the mean of its divisors is an integer number (577321761).

Almost surely, 2^1154643521 is an apocalyptic number.

It is an amenable number.

1154643521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154643521 is an equidigital number, since it uses as much as digits as its factorization.

1154643521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 1154643521 is about 33980.0459240420. The cubic root of 1154643521 is about 1049.0977952284.

The spelling of 1154643521 in words is "one billion, one hundred fifty-four million, six hundred forty-three thousand, five hundred twenty-one".