1265173051 has 2 divisors, whose sum is σ = 1265173052. Its totient is φ = 1265173050.

The previous prime is 1265173027. The next prime is 1265173061. The reversal of 1265173051 is 1503715621.

It is a strong prime.

It is an emirp because it is prime and its reverse (1503715621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265173051 - 2²⁷ = 1130955323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265173061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632586525 + 632586526.

It is an arithmetic number, because the mean of its divisors is an integer number (632586526).

Almost surely, 2^1265173051 is an apocalyptic number.

1265173051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265173051 is an equidigital number, since it uses as much as digits as its factorization.

1265173051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 1265173051 is about 35569.2711620578. The cubic root of 1265173051 is about 1081.5584071915.

Adding to 1265173051 its reverse (1503715621), we get a palindrome (2768888672).

The spelling of 1265173051 in words is "one billion, two hundred sixty-five million, one hundred seventy-three thousand, fifty-one".