1264731907609 has 3 divisors (see below), whose sum is σ = 1264733032213. Its totient is φ = 1264730783006.

The previous prime is 1264731907603. The next prime is 1264731907651. The reversal of 1264731907609 is 9067091374621.

The square root of 1264731907609 is 1124603.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1264731907609 - 2¹⁵ = 1264731874841 is a prime.

It is a super-2 number, since 2×1264731907609² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1264731907609.

It is not an unprimeable number, because it can be changed into a prime (1264731907603) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 562302 + ... + 1686904.

Almost surely, 2^{1264731907609} is an apocalyptic number.

1264731907609 is the 1124603-rd square number.

1264731907609 is the 562302-nd centered octagonal number.

It is an amenable number.

1264731907609 is a deficient number, since it is larger than the sum of its proper divisors (1124604).

1264731907609 is an frugal number, since it uses more digits than its factorization.

1264731907609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249206 (or 1124603 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 1264731907609 in words is "one trillion, two hundred sixty-four billion, seven hundred thirty-one million, nine hundred seven thousand, six hundred nine".