5368831981 has 4 divisors (see below), whose sum is σ = 5369410332. Its totient is φ = 5368253632.

The previous prime is 5368831967. The next prime is 5368831991. The reversal of 5368831981 is 1891388635.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4195152900 + 1173679081 = 64770^2 + 34259^2 .

It is a cyclic number.

It is not a de Polignac number, because 5368831981 - 2²¹ = 5366734829 is a prime.

It is a super-2 number, since 2×5368831981² = 57648713680416768722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5368831991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275020 + ... + 293893.

It is an arithmetic number, because the mean of its divisors is an integer number (1342352583).

Almost surely, 2^5368831981 is an apocalyptic number.

It is an amenable number.

5368831981 is a deficient number, since it is larger than the sum of its proper divisors (578351).

5368831981 is an equidigital number, since it uses as much as digits as its factorization.

5368831981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578350.

The product of its digits is 1244160, while the sum is 52.

The square root of 5368831981 is about 73272.3138777533. The cubic root of 5368831981 is about 1751.0287264165.

The spelling of 5368831981 in words is "five billion, three hundred sixty-eight million, eight hundred thirty-one thousand, nine hundred eighty-one".