1311255351 has 64 divisors (see below), whose sum is σ = 2292019200. Its totient is φ = 725407488.

The previous prime is 1311255347. The next prime is 1311255367. The reversal of 1311255351 is 1535521131.

1311255351 is a `hidden beast` number, since 1 + 3 + 1 + 125 + 535 + 1 = 666.

It is not a de Polignac number, because 1311255351 - 2² = 1311255347 is a prime.

It is a super-2 number, since 2×1311255351² = 3438781191052266402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311255551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 790515 + ... + 792171.

It is an arithmetic number, because the mean of its divisors is an integer number (35812800).

Almost surely, 2^1311255351 is an apocalyptic number.

1311255351 is a deficient number, since it is larger than the sum of its proper divisors (980763849).

1311255351 is a wasteful number, since it uses less digits than its factorization.

1311255351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805 (or 1799 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1311255351 is about 36211.2600029328. The cubic root of 1311255351 is about 1094.5335825540.

Adding to 1311255351 its reverse (1535521131), we get a palindrome (2846776482).

The spelling of 1311255351 in words is "one billion, three hundred eleven million, two hundred fifty-five thousand, three hundred fifty-one".