3551642981 has 2 divisors, whose sum is σ = 3551642982. Its totient is φ = 3551642980.

The previous prime is 3551642977. The next prime is 3551642993. The reversal of 3551642981 is 1892461553.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3430444900 + 121198081 = 58570^2 + 11009^2 .

It is an emirp because it is prime and its reverse (1892461553) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3551642981 - 2² = 3551642977 is a prime.

It is a super-2 number, since 2×3551642981² = 25228335728973132722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3551642951) 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, 1775821490 + 1775821491.

It is an arithmetic number, because the mean of its divisors is an integer number (1775821491).

Almost surely, 2^3551642981 is an apocalyptic number.

It is an amenable number.

3551642981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3551642981 is an equidigital number, since it uses as much as digits as its factorization.

3551642981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 44.

The square root of 3551642981 is about 59595.6624344423. The cubic root of 3551642981 is about 1525.7256037806.

The spelling of 3551642981 in words is "three billion, five hundred fifty-one million, six hundred forty-two thousand, nine hundred eighty-one".