1280223761 has 2 divisors, whose sum is σ = 1280223762. Its totient is φ = 1280223760.

The previous prime is 1280223757. The next prime is 1280223767. The reversal of 1280223761 is 1673220821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 771450625 + 508773136 = 27775^2 + 22556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280223761 - 2² = 1280223757 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280223767) 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, 640111880 + 640111881.

It is an arithmetic number, because the mean of its divisors is an integer number (640111881).

Almost surely, 2^1280223761 is an apocalyptic number.

It is an amenable number.

1280223761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280223761 is an equidigital number, since it uses as much as digits as its factorization.

1280223761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1280223761 is about 35780.2146583835. The cubic root of 1280223761 is about 1085.8303117849.

It can be divided in two parts, 12802 and 23761, that added together give a palindrome (36563).

The spelling of 1280223761 in words is "one billion, two hundred eighty million, two hundred twenty-three thousand, seven hundred sixty-one".