1265242619 has 2 divisors, whose sum is σ = 1265242620. Its totient is φ = 1265242618.

The previous prime is 1265242603. The next prime is 1265242631. The reversal of 1265242619 is 9162425621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1265242619 - 2⁴ = 1265242603 is a prime.

It is a super-2 number, since 2×1265242619² = 3201677769867958322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1265202619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632621309 + 632621310.

It is an arithmetic number, because the mean of its divisors is an integer number (632621310).

Almost surely, 2^1265242619 is an apocalyptic number.

1265242619 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265242619 is an equidigital number, since it uses as much as digits as its factorization.

1265242619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 1265242619 is about 35570.2490713799. The cubic root of 1265242619 is about 1081.5782306921.

The spelling of 1265242619 in words is "one billion, two hundred sixty-five million, two hundred forty-two thousand, six hundred nineteen".