1265347073 has 4 divisors (see below), whose sum is σ = 1265418240. Its totient is φ = 1265275908.

The previous prime is 1265347051. The next prime is 1265347091. The reversal of 1265347073 is 3707435621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3707435621 = 26597 ⋅139393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265347073 is a prime.

It is a super-2 number, since 2×1265347073² = 3202206430299334658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265347003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16448 + ... + 52926.

It is an arithmetic number, because the mean of its divisors is an integer number (316354560).

Almost surely, 2^1265347073 is an apocalyptic number.

It is an amenable number.

1265347073 is a deficient number, since it is larger than the sum of its proper divisors (71167).

1265347073 is an equidigital number, since it uses as much as digits as its factorization.

1265347073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71166.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 1265347073 is about 35571.7173186789. The cubic root of 1265347073 is about 1081.6079936435.

The spelling of 1265347073 in words is "one billion, two hundred sixty-five million, three hundred forty-seven thousand, seventy-three".