5311287981 has 6 divisors (see below), whose sum is σ = 7671860430. Its totient is φ = 3540858648.

The previous prime is 5311287967. The next prime is 5311288049. The reversal of 5311287981 is 1897821135.

5311287981 is a `hidden beast` number, since 531 + 1 + 28 + 7 + 98 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2717015625 + 2594272356 = 52125^2 + 50934^2 .

It is not a de Polignac number, because 5311287981 - 2⁹ = 5311287469 is a prime.

It is a super-2 number, since 2×5311287981² = 56419560034230112722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5311287941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 295071546 + ... + 295071563.

It is an arithmetic number, because the mean of its divisors is an integer number (1278643405).

Almost surely, 2^5311287981 is an apocalyptic number.

It is an amenable number.

5311287981 is a deficient number, since it is larger than the sum of its proper divisors (2360572449).

5311287981 is a wasteful number, since it uses less digits than its factorization.

5311287981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590143115 (or 590143112 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 5311287981 is about 72878.5838295449. The cubic root of 5311287981 is about 1744.7503063335.

The spelling of 5311287981 in words is "five billion, three hundred eleven million, two hundred eighty-seven thousand, nine hundred eighty-one".