1265272901 has 2 divisors, whose sum is σ = 1265272902. Its totient is φ = 1265272900.

The previous prime is 1265272867. The next prime is 1265272949. The reversal of 1265272901 is 1092725621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1224300100 + 40972801 = 34990^2 + 6401^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265272901 - 2¹⁰ = 1265271877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265272951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632636450 + 632636451.

It is an arithmetic number, because the mean of its divisors is an integer number (632636451).

Almost surely, 2^1265272901 is an apocalyptic number.

It is an amenable number.

1265272901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265272901 is an equidigital number, since it uses as much as digits as its factorization.

1265272901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1265272901 is about 35570.6747335498. The cubic root of 1265272901 is about 1081.5868593641.

The spelling of 1265272901 in words is "one billion, two hundred sixty-five million, two hundred seventy-two thousand, nine hundred one".