3543121981 has 4 divisors (see below), whose sum is σ = 4049282272. Its totient is φ = 3036961692.

The previous prime is 3543121973. The next prime is 3543122003. The reversal of 3543121981 is 1891213453.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3543121981 - 2³ = 3543121973 is a prime.

It is a super-2 number, since 2×3543121981² = 25107426744490728722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3543121981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3543121381) 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 in 3 ways as a sum of consecutive naturals, for example, 253080135 + ... + 253080148.

It is an arithmetic number, because the mean of its divisors is an integer number (1012320568).

Almost surely, 2^3543121981 is an apocalyptic number.

It is an amenable number.

3543121981 is a deficient number, since it is larger than the sum of its proper divisors (506160291).

3543121981 is an equidigital number, since it uses as much as digits as its factorization.

3543121981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506160290.

The product of its digits is 25920, while the sum is 37.

The square root of 3543121981 is about 59524.1294014453. The cubic root of 3543121981 is about 1524.5044676477.

The spelling of 3543121981 in words is "three billion, five hundred forty-three million, one hundred twenty-one thousand, nine hundred eighty-one".