1265242631 has 2 divisors, whose sum is σ = 1265242632. Its totient is φ = 1265242630.

The previous prime is 1265242619. The next prime is 1265242681. The reversal of 1265242631 is 1362425621.

It is a weak prime.

It is an emirp because it is prime and its reverse (1362425621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265242631 - 2¹⁴ = 1265226247 is a prime.

It is a super-2 number, since 2×1265242631² = 3201677830599604322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265242681) 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, 632621315 + 632621316.

It is an arithmetic number, because the mean of its divisors is an integer number (632621316).

Almost surely, 2^1265242631 is an apocalyptic number.

1265242631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265242631 is an equidigital number, since it uses as much as digits as its factorization.

1265242631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The square root of 1265242631 is about 35570.2492400602. The cubic root of 1265242631 is about 1081.5782341114.

The spelling of 1265242631 in words is "one billion, two hundred sixty-five million, two hundred forty-two thousand, six hundred thirty-one".