6121439661 has 4 divisors (see below), whose sum is σ = 8161919552. Its totient is φ = 4080959772.

The previous prime is 6121439651. The next prime is 6121439663. The reversal of 6121439661 is 1669341216.

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 not a de Polignac number, because 6121439661 - 2⁵ = 6121439629 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 (6121439663) 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, 1020239941 + ... + 1020239946.

It is an arithmetic number, because the mean of its divisors is an integer number (2040479888).

Almost surely, 2^6121439661 is an apocalyptic number.

It is an amenable number.

6121439661 is a deficient number, since it is larger than the sum of its proper divisors (2040479891).

6121439661 is a wasteful number, since it uses less digits than its factorization.

6121439661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040479890.

The product of its digits is 46656, while the sum is 39.

The square root of 6121439661 is about 78239.6297345533. The cubic root of 6121439661 is about 1829.2982728612.

The spelling of 6121439661 in words is "six billion, one hundred twenty-one million, four hundred thirty-nine thousand, six hundred sixty-one".