3617561681 has 4 divisors (see below), whose sum is σ = 3618111600. Its totient is φ = 3617011764.

The previous prime is 3617561621. The next prime is 3617561687. The reversal of 3617561681 is 1861657163.

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 3617561681 - 2⁶ = 3617561617 is a prime.

It is a super-2 number, since 2×3617561681² = 26173505031679091522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3617561687) 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, 264971 + ... + 278288.

It is an arithmetic number, because the mean of its divisors is an integer number (904527900).

Almost surely, 2^3617561681 is an apocalyptic number.

It is an amenable number.

3617561681 is a deficient number, since it is larger than the sum of its proper divisors (549919).

3617561681 is an equidigital number, since it uses as much as digits as its factorization.

3617561681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549918.

The product of its digits is 181440, while the sum is 44.

The square root of 3617561681 is about 60146.1692961405. The cubic root of 3617561681 is about 1535.1069865695.

The spelling of 3617561681 in words is "three billion, six hundred seventeen million, five hundred sixty-one thousand, six hundred eighty-one".