3547859981 has 2 divisors, whose sum is σ = 3547859982. Its totient is φ = 3547859980.

The previous prime is 3547859977. The next prime is 3547860023. The reversal of 3547859981 is 1899587453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1913275081 + 1634584900 = 43741^2 + 40430^2 .

It is a cyclic number.

It is not a de Polignac number, because 3547859981 - 2² = 3547859977 is a prime.

It is a super-2 number, since 2×3547859981² = 25174620889562640722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3547859981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3547859281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1773929990 + 1773929991.

It is an arithmetic number, because the mean of its divisors is an integer number (1773929991).

Almost surely, 2^3547859981 is an apocalyptic number.

It is an amenable number.

3547859981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3547859981 is an equidigital number, since it uses as much as digits as its factorization.

3547859981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 59.

The square root of 3547859981 is about 59563.9150912698. The cubic root of 3547859981 is about 1525.1837071175.

It can be divided in two parts, 35478 and 59981, that added together give a palindrome (95459).

The spelling of 3547859981 in words is "three billion, five hundred forty-seven million, eight hundred fifty-nine thousand, nine hundred eighty-one".