1264403761 has 2 divisors, whose sum is σ = 1264403762. Its totient is φ = 1264403760.

The previous prime is 1264403731. The next prime is 1264403809. The reversal of 1264403761 is 1673044621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 681471025 + 582932736 = 26105^2 + 24144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264403761 - 2¹⁷ = 1264272689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1264403711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632201880 + 632201881.

It is an arithmetic number, because the mean of its divisors is an integer number (632201881).

Almost surely, 2^1264403761 is an apocalyptic number.

It is an amenable number.

1264403761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264403761 is an equidigital number, since it uses as much as digits as its factorization.

1264403761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 1264403761 is about 35558.4555485752. The cubic root of 1264403761 is about 1081.3391484472.

The spelling of 1264403761 in words is "one billion, two hundred sixty-four million, four hundred three thousand, seven hundred sixty-one".