1296265157 has 4 divisors (see below), whose sum is σ = 1414107456. Its totient is φ = 1178422860.

The previous prime is 1296265133. The next prime is 1296265163. The reversal of 1296265157 is 7515626921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1296265157 - 2⁸ = 1296264901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296265127) 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 in 3 ways as a sum of consecutive naturals, for example, 58921133 + ... + 58921154.

It is an arithmetic number, because the mean of its divisors is an integer number (353526864).

Almost surely, 2^1296265157 is an apocalyptic number.

It is an amenable number.

1296265157 is a deficient number, since it is larger than the sum of its proper divisors (117842299).

1296265157 is a wasteful number, since it uses less digits than its factorization.

1296265157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117842298.

The product of its digits is 226800, while the sum is 44.

The square root of 1296265157 is about 36003.6825477617. The cubic root of 1296265157 is about 1090.3467059136.

The spelling of 1296265157 in words is "one billion, two hundred ninety-six million, two hundred sixty-five thousand, one hundred fifty-seven".