6428451961 has 4 divisors (see below), whose sum is σ = 6806596212. Its totient is φ = 6050307712.

The previous prime is 6428451947. The next prime is 6428451971. The reversal of 6428451961 is 1691548246.

It is a happy number.

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 5568144400 + 860307561 = 74620^2 + 29331^2 .

It is a cyclic number.

It is not a de Polignac number, because 6428451961 - 2⁷ = 6428451833 is a prime.

It is a super-2 number, since 2×6428451961² = 82649989229769491042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6428451901) 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, 189072100 + ... + 189072133.

It is an arithmetic number, because the mean of its divisors is an integer number (1701649053).

Almost surely, 2^6428451961 is an apocalyptic number.

It is an amenable number.

6428451961 is a deficient number, since it is larger than the sum of its proper divisors (378144251).

6428451961 is a wasteful number, since it uses less digits than its factorization.

6428451961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378144250.

The product of its digits is 414720, while the sum is 46.

The square root of 6428451961 is about 80177.6275590641. The cubic root of 6428451961 is about 1859.3827644206.

The spelling of 6428451961 in words is "six billion, four hundred twenty-eight million, four hundred fifty-one thousand, nine hundred sixty-one".