6531240061 has 2 divisors, whose sum is σ = 6531240062. Its totient is φ = 6531240060.

The previous prime is 6531240059. The next prime is 6531240073. The reversal of 6531240061 is 1600421356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5450868900 + 1080371161 = 73830^2 + 32869^2 .

It is a cyclic number.

It is not a de Polignac number, because 6531240061 - 2¹ = 6531240059 is a prime.

It is a super-2 number, since 2×6531240061² = 85314193468822567442, which contains 22 as substring.

Together with 6531240059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6531240161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3265620030 + 3265620031.

It is an arithmetic number, because the mean of its divisors is an integer number (3265620031).

Almost surely, 2^6531240061 is an apocalyptic number.

It is an amenable number.

6531240061 is a deficient number, since it is larger than the sum of its proper divisors (1).

6531240061 is an equidigital number, since it uses as much as digits as its factorization.

6531240061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6531240061 is about 80816.0878847770. The cubic root of 6531240061 is about 1869.2406442462.

The spelling of 6531240061 in words is "six billion, five hundred thirty-one million, two hundred forty thousand, sixty-one".