6151042721 has 4 divisors (see below), whose sum is σ = 6152710212. Its totient is φ = 6149375232.

The previous prime is 6151042687. The next prime is 6151042739. The reversal of 6151042721 is 1272401516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3012802321 + 3138240400 = 54889^2 + 56020^2 .

It is a cyclic number.

It is not a de Polignac number, because 6151042721 - 2¹⁴ = 6151026337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6151042741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828200 + ... + 835593.

It is an arithmetic number, because the mean of its divisors is an integer number (1538177553).

Almost surely, 2^6151042721 is an apocalyptic number.

It is an amenable number.

6151042721 is a deficient number, since it is larger than the sum of its proper divisors (1667491).

6151042721 is a wasteful number, since it uses less digits than its factorization.

6151042721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667490.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 6151042721 is about 78428.5835712975. The cubic root of 6151042721 is about 1832.2423388324.

The spelling of 6151042721 in words is "six billion, one hundred fifty-one million, forty-two thousand, seven hundred twenty-one".