6451879409 has 2 divisors, whose sum is σ = 6451879410. Its totient is φ = 6451879408.

The previous prime is 6451879391. The next prime is 6451879453. The reversal of 6451879409 is 9049781546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5513805025 + 938074384 = 74255^2 + 30628^2 .

It is a cyclic number.

It is not a de Polignac number, because 6451879409 - 2¹⁶ = 6451813873 is a prime.

It is not a weakly prime, because it can be changed into another prime (6451879459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3225939704 + 3225939705.

It is an arithmetic number, because the mean of its divisors is an integer number (3225939705).

Almost surely, 2^6451879409 is an apocalyptic number.

It is an amenable number.

6451879409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6451879409 is an equidigital number, since it uses as much as digits as its factorization.

6451879409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 6451879409 is about 80323.5918581832. The cubic root of 6451879409 is about 1861.6387654851.

The spelling of 6451879409 in words is "six billion, four hundred fifty-one million, eight hundred seventy-nine thousand, four hundred nine".