3870361981 has 2 divisors, whose sum is σ = 3870361982. Its totient is φ = 3870361980.

The previous prime is 3870361973. The next prime is 3870361987. The reversal of 3870361981 is 1891630783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3423420100 + 446941881 = 58510^2 + 21141^2 .

It is a cyclic number.

It is not a de Polignac number, because 3870361981 - 2³ = 3870361973 is a prime.

It is a super-2 number, since 2×3870361981² = 29959403727940488722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3870361987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1935180990 + 1935180991.

It is an arithmetic number, because the mean of its divisors is an integer number (1935180991).

Almost surely, 2^3870361981 is an apocalyptic number.

It is an amenable number.

3870361981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3870361981 is an equidigital number, since it uses as much as digits as its factorization.

3870361981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 3870361981 is about 62212.2333709376. The cubic root of 3870361981 is about 1570.0634186724.

It can be divided in two parts, 387036 and 1981, that added together give a cube (389017 = 73³).

The spelling of 3870361981 in words is "three billion, eight hundred seventy million, three hundred sixty-one thousand, nine hundred eighty-one".