3835951981 has 2 divisors, whose sum is σ = 3835951982. Its totient is φ = 3835951980.

The previous prime is 3835951967. The next prime is 3835951991. The reversal of 3835951981 is 1891595383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2069431081 + 1766520900 = 45491^2 + 42030^2 .

It is a cyclic number.

It is not a de Polignac number, because 3835951981 - 2¹⁹ = 3835427693 is a prime.

It is a super-2 number, since 2×3835951981² = 29429055201075648722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3835951991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1917975990 + 1917975991.

It is an arithmetic number, because the mean of its divisors is an integer number (1917975991).

Almost surely, 2^3835951981 is an apocalyptic number.

It is an amenable number.

3835951981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3835951981 is an equidigital number, since it uses as much as digits as its factorization.

3835951981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 52.

The square root of 3835951981 is about 61935.0626139992. The cubic root of 3835951981 is about 1565.3966040195.

The spelling of 3835951981 in words is "three billion, eight hundred thirty-five million, nine hundred fifty-one thousand, nine hundred eighty-one".