1265173073 has 2 divisors, whose sum is σ = 1265173074. Its totient is φ = 1265173072.

The previous prime is 1265173061. The next prime is 1265173103. The reversal of 1265173073 is 3703715621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1255143184 + 10029889 = 35428^2 + 3167^2 .

It is an emirp because it is prime and its reverse (3703715621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265173073 - 2⁶ = 1265173009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265175073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632586536 + 632586537.

It is an arithmetic number, because the mean of its divisors is an integer number (632586537).

Almost surely, 2^1265173073 is an apocalyptic number.

It is an amenable number.

1265173073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265173073 is an equidigital number, since it uses as much as digits as its factorization.

1265173073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 1265173073 is about 35569.2714713136. The cubic root of 1265173073 is about 1081.5584134605.

Adding to 1265173073 its reverse (3703715621), we get a palindrome (4968888694).

The spelling of 1265173073 in words is "one billion, two hundred sixty-five million, one hundred seventy-three thousand, seventy-three".