3867531247561 has 2 divisors, whose sum is σ = 3867531247562. Its totient is φ = 3867531247560.

The previous prime is 3867531247549. The next prime is 3867531247597. The reversal of 3867531247561 is 1657421357683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2335184353161 + 1532346894400 = 1528131^2 + 1237880^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867531247561 - 2¹⁷ = 3867531116489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3867531247496 and 3867531247505.

It is not a weakly prime, because it can be changed into another prime (3867531247511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933765623780 + 1933765623781.

It is an arithmetic number, because the mean of its divisors is an integer number (1933765623781).

Almost surely, 2^{3867531247561} is an apocalyptic number.

It is an amenable number.

3867531247561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867531247561 is an equidigital number, since it uses as much as digits as its factorization.

3867531247561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 58.

The spelling of 3867531247561 in words is "three trillion, eight hundred sixty-seven billion, five hundred thirty-one million, two hundred forty-seven thousand, five hundred sixty-one".