6121975681 has 4 divisors (see below), whose sum is σ = 6123801600. Its totient is φ = 6120149764.

The previous prime is 6121975667. The next prime is 6121975687. The reversal of 6121975681 is 1865791216.

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 6121975681 - 2⁵ = 6121975649 is a prime.

It is a super-2 number, since 2×6121975681² = 74957172477510827522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6121975687) 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, 907921 + ... + 914638.

It is an arithmetic number, because the mean of its divisors is an integer number (1530950400).

Almost surely, 2^6121975681 is an apocalyptic number.

It is an amenable number.

6121975681 is a deficient number, since it is larger than the sum of its proper divisors (1825919).

6121975681 is a wasteful number, since it uses less digits than its factorization.

6121975681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825918.

The product of its digits is 181440, while the sum is 46.

The square root of 6121975681 is about 78243.0551614646. The cubic root of 6121975681 is about 1829.3516650857.

It can be divided in two parts, 61219 and 75681, that added together give a square (136900 = 370²).

The spelling of 6121975681 in words is "six billion, one hundred twenty-one million, nine hundred seventy-five thousand, six hundred eighty-one".