6531124381 has 2 divisors, whose sum is σ = 6531124382. Its totient is φ = 6531124380.

The previous prime is 6531124349. The next prime is 6531124399. The reversal of 6531124381 is 1834211356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3391315225 + 3139809156 = 58235^2 + 56034^2 .

It is a cyclic number.

It is not a de Polignac number, because 6531124381 - 2⁵ = 6531124349 is a prime.

It is a super-2 number, since 2×6531124381² = 85311171360185266322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6531124331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265562190 + 3265562191.

It is an arithmetic number, because the mean of its divisors is an integer number (3265562191).

Almost surely, 2^6531124381 is an apocalyptic number.

It is an amenable number.

6531124381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531124381 is an equidigital number, since it uses as much as digits as its factorization.

6531124381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 6531124381 is about 80815.3721825248. The cubic root of 6531124381 is about 1869.2296083105.

The spelling of 6531124381 in words is "six billion, five hundred thirty-one million, one hundred twenty-four thousand, three hundred eighty-one".