3621981131 has 6 divisors (see below), whose sum is σ = 3742589196. Its totient is φ = 3505142100.

The previous prime is 3621981107. The next prime is 3621981133. The reversal of 3621981131 is 1311891263.

It is not a de Polignac number, because 3621981131 - 2²⁶ = 3554872267 is a prime.

It is a super-2 number, since 2×3621981131² = 26237494626640078322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3621981091 and 3621981100.

It is not an unprimeable number, because it can be changed into a prime (3621981133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1883525 + ... + 1885446.

It is an arithmetic number, because the mean of its divisors is an integer number (623764866).

Almost surely, 2^3621981131 is an apocalyptic number.

3621981131 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3621981131 is a deficient number, since it is larger than the sum of its proper divisors (120608065).

3621981131 is an equidigital number, since it uses as much as digits as its factorization.

3621981131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3769033 (or 3769002 counting only the distinct ones).

The product of its digits is 7776, while the sum is 35.

The square root of 3621981131 is about 60182.8973297232. The cubic root of 3621981131 is about 1535.7318612150.

The spelling of 3621981131 in words is "three billion, six hundred twenty-one million, nine hundred eighty-one thousand, one hundred thirty-one".