2531326561 has 2 divisors, whose sum is σ = 2531326562. Its totient is φ = 2531326560.

The previous prime is 2531326529. The next prime is 2531326579. The reversal of 2531326561 is 1656231352.

2531326561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2337142336 + 194184225 = 48344^2 + 13935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531326561 - 2⁵ = 2531326529 is a prime.

It is a super-2 number, since 2×2531326561² = 12815228316848173442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2531326261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265663280 + 1265663281.

It is an arithmetic number, because the mean of its divisors is an integer number (1265663281).

Almost surely, 2^2531326561 is an apocalyptic number.

It is an amenable number.

2531326561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531326561 is an equidigital number, since it uses as much as digits as its factorization.

2531326561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 2531326561 is about 50312.2903573272. The cubic root of 2531326561 is about 1362.8541847888.

The spelling of 2531326561 in words is "two billion, five hundred thirty-one million, three hundred twenty-six thousand, five hundred sixty-one".