1452643681 has 2 divisors, whose sum is σ = 1452643682. Its totient is φ = 1452643680.

The previous prime is 1452643667. The next prime is 1452643783. The reversal of 1452643681 is 1863462541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1134342400 + 318301281 = 33680^2 + 17841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1452643681 - 2²¹ = 1450546529 is a prime.

It is a super-2 number, since 2×1452643681² = 4220347327898459522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1452644681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 726321840 + 726321841.

It is an arithmetic number, because the mean of its divisors is an integer number (726321841).

Almost surely, 2^1452643681 is an apocalyptic number.

It is an amenable number.

1452643681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1452643681 is an equidigital number, since it uses as much as digits as its factorization.

1452643681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 40.

The square root of 1452643681 is about 38113.5629533635. The cubic root of 1452643681 is about 1132.5386527034.

The spelling of 1452643681 in words is "one billion, four hundred fifty-two million, six hundred forty-three thousand, six hundred eighty-one".