3621981101 has 4 divisors (see below), whose sum is σ = 3627284832. Its totient is φ = 3616677372.

The previous prime is 3621981091. The next prime is 3621981107. The reversal of 3621981101 is 1011891263.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1011891263 = 83 ⋅12191461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3621981101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621981107) 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 3 ways as a sum of consecutive naturals, for example, 2650841 + ... + 2652206.

It is an arithmetic number, because the mean of its divisors is an integer number (906821208).

Almost surely, 2^3621981101 is an apocalyptic number.

It is an amenable number.

3621981101 is a deficient number, since it is larger than the sum of its proper divisors (5303731).

3621981101 is an equidigital number, since it uses as much as digits as its factorization.

3621981101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303730.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 3621981101 is about 60182.8970804829. The cubic root of 3621981101 is about 1535.7318569750.

The spelling of 3621981101 in words is "three billion, six hundred twenty-one million, nine hundred eighty-one thousand, one hundred one".