1265193481 has 2 divisors, whose sum is σ = 1265193482. Its totient is φ = 1265193480.

The previous prime is 1265193443. The next prime is 1265193511. The reversal of 1265193481 is 1843915621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1019205625 + 245987856 = 31925^2 + 15684^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265193481 - 2⁹ = 1265192969 is a prime.

It is a super-2 number, since 2×1265193481² = 3201429088729794722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1265193401) 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, 632596740 + 632596741.

It is an arithmetic number, because the mean of its divisors is an integer number (632596741).

Almost surely, 2^1265193481 is an apocalyptic number.

It is an amenable number.

1265193481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265193481 is an equidigital number, since it uses as much as digits as its factorization.

1265193481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 1265193481 is about 35569.5583469910. The cubic root of 1265193481 is about 1081.5642288244.

The spelling of 1265193481 in words is "one billion, two hundred sixty-five million, one hundred ninety-three thousand, four hundred eighty-one".