1264507709 has 2 divisors, whose sum is σ = 1264507710. Its totient is φ = 1264507708.

The previous prime is 1264507681. The next prime is 1264507729. The reversal of 1264507709 is 9077054621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1255639225 + 8868484 = 35435^2 + 2978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264507709 is a prime.

It is a super-2 number, since 2×1264507709² = 3197959492240857362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264507729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632253854 + 632253855.

It is an arithmetic number, because the mean of its divisors is an integer number (632253855).

Almost surely, 2^1264507709 is an apocalyptic number.

It is an amenable number.

1264507709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264507709 is an equidigital number, since it uses as much as digits as its factorization.

1264507709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 1264507709 is about 35559.9171680700. The cubic root of 1264507709 is about 1081.3687803219.

The spelling of 1264507709 in words is "one billion, two hundred sixty-four million, five hundred seven thousand, seven hundred nine".