3867572851981 has 2 divisors, whose sum is σ = 3867572851982. Its totient is φ = 3867572851980.

The previous prime is 3867572851973. The next prime is 3867572852063. The reversal of 3867572851981 is 1891582757683.

3867572851981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3867535226025 + 37625956 = 1966605^2 + 6134^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867572851981 - 2³ = 3867572851973 is a prime.

It is a super-2 number, since 2×3867572851981² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3867572851981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3867572851931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933786425990 + 1933786425991.

It is an arithmetic number, because the mean of its divisors is an integer number (1933786425991).

Almost surely, 2^{3867572851981} is an apocalyptic number.

It is an amenable number.

3867572851981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867572851981 is an equidigital number, since it uses as much as digits as its factorization.

3867572851981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 203212800, while the sum is 70.

The spelling of 3867572851981 in words is "three trillion, eight hundred sixty-seven billion, five hundred seventy-two million, eight hundred fifty-one thousand, nine hundred eighty-one".