1320264521 has 2 divisors, whose sum is σ = 1320264522. Its totient is φ = 1320264520.

The previous prime is 1320264467. The next prime is 1320264529. The reversal of 1320264521 is 1254620231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123255225 + 197009296 = 33515^2 + 14036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320264521 - 2³⁰ = 246522697 is a prime.

It is a super-2 number, since 2×1320264521² = 3486196810822718882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1320264529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660132260 + 660132261.

It is an arithmetic number, because the mean of its divisors is an integer number (660132261).

Almost surely, 2^1320264521 is an apocalyptic number.

It is an amenable number.

1320264521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320264521 is an equidigital number, since it uses as much as digits as its factorization.

1320264521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1320264521 is about 36335.4444172629. Note that the first 4 decimals coincide. The cubic root of 1320264521 is about 1097.0345806689.

Adding to 1320264521 its reverse (1254620231), we get a palindrome (2574884752).

The spelling of 1320264521 in words is "one billion, three hundred twenty million, two hundred sixty-four thousand, five hundred twenty-one".