6900531581 has 2 divisors, whose sum is σ = 6900531582. Its totient is φ = 6900531580.

The previous prime is 6900531571. The next prime is 6900531601. The reversal of 6900531581 is 1851350096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6840778681 + 59752900 = 82709^2 + 7730^2 .

It is a cyclic number.

It is not a de Polignac number, because 6900531581 - 2²² = 6896337277 is a prime.

It is a super-2 number, since 2×6900531581² = 95234672200756719122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6900531541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3450265790 + 3450265791.

It is an arithmetic number, because the mean of its divisors is an integer number (3450265791).

Almost surely, 2^6900531581 is an apocalyptic number.

It is an amenable number.

6900531581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6900531581 is an equidigital number, since it uses as much as digits as its factorization.

6900531581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 6900531581 is about 83069.4383091640. The cubic root of 6900531581 is about 1903.8271501935.

The spelling of 6900531581 in words is "six billion, nine hundred million, five hundred thirty-one thousand, five hundred eighty-one".