1316231351565 has 128 divisors (see below), whose sum is σ = 2380438126080. Its totient is φ = 616547635200.

The previous prime is 1316231351521. The next prime is 1316231351579. The reversal of 1316231351565 is 5651531326131.

It is not a de Polignac number, because 1316231351565 - 2¹² = 1316231347469 is a prime.

It is a super-3 number, since 3×1316231351565³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 197599335 + ... + 197605995.

It is an arithmetic number, because the mean of its divisors is an integer number (18597172860).

Almost surely, 2^{1316231351565} is an apocalyptic number.

1316231351565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1316231351565 is a deficient number, since it is larger than the sum of its proper divisors (1064206774515).

1316231351565 is a wasteful number, since it uses less digits than its factorization.

1316231351565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7215.

The product of its digits is 243000, while the sum is 42.

Adding to 1316231351565 its reverse (5651531326131), we get a palindrome (6967762677696).

The spelling of 1316231351565 in words is "one trillion, three hundred sixteen billion, two hundred thirty-one million, three hundred fifty-one thousand, five hundred sixty-five".