1265173061 has 2 divisors, whose sum is σ = 1265173062. Its totient is φ = 1265173060.

The previous prime is 1265173051. The next prime is 1265173073. The reversal of 1265173061 is 1603715621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1225420036 + 39753025 = 35006^2 + 6305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265173061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265173051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632586530 + 632586531.

It is an arithmetic number, because the mean of its divisors is an integer number (632586531).

Almost surely, 2^1265173061 is an apocalyptic number.

It is an amenable number.

1265173061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265173061 is an equidigital number, since it uses as much as digits as its factorization.

1265173061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 1265173061 is about 35569.2713026286. The cubic root of 1265173061 is about 1081.5584100410.

Adding to 1265173061 its reverse (1603715621), we get a palindrome (2868888682).

The spelling of 1265173061 in words is "one billion, two hundred sixty-five million, one hundred seventy-three thousand, sixty-one".