3189478981 has 4 divisors (see below), whose sum is σ = 3434823532. Its totient is φ = 2944134432.

The previous prime is 3189478973. The next prime is 3189478991. The reversal of 3189478981 is 1898749813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1063346881 + 2126132100 = 32609^2 + 46110^2 .

It is a cyclic number.

It is not a de Polignac number, because 3189478981 - 2³ = 3189478973 is a prime.

It is a super-2 number, since 2×3189478981² = 20345552340481596722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3189478991) 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, 122672256 + ... + 122672281.

It is an arithmetic number, because the mean of its divisors is an integer number (858705883).

Almost surely, 2^3189478981 is an apocalyptic number.

It is an amenable number.

3189478981 is a deficient number, since it is larger than the sum of its proper divisors (245344551).

3189478981 is a wasteful number, since it uses less digits than its factorization.

3189478981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245344550.

The product of its digits is 3483648, while the sum is 58.

The square root of 3189478981 is about 56475.4723840359. The cubic root of 3189478981 is about 1471.9958360599.

The spelling of 3189478981 in words is "three billion, one hundred eighty-nine million, four hundred seventy-eight thousand, nine hundred eighty-one".