1264772581 has 2 divisors, whose sum is σ = 1264772582. Its totient is φ = 1264772580.

The previous prime is 1264772573. The next prime is 1264772611. The reversal of 1264772581 is 1852774621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222131681 + 42640900 = 34959^2 + 6530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264772581 - 2³ = 1264772573 is a prime.

It is a super-2 number, since 2×1264772581² = 3199299363298803122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264772521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632386290 + 632386291.

It is an arithmetic number, because the mean of its divisors is an integer number (632386291).

Almost surely, 2^1264772581 is an apocalyptic number.

It is an amenable number.

1264772581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264772581 is an equidigital number, since it uses as much as digits as its factorization.

1264772581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 1264772581 is about 35563.6412786992. The cubic root of 1264772581 is about 1081.4442785608. Note that the first 3 decimals are identical.

The spelling of 1264772581 in words is "one billion, two hundred sixty-four million, seven hundred seventy-two thousand, five hundred eighty-one".