51979409 has 2 divisors, whose sum is σ = 51979410. Its totient is φ = 51979408.

The previous prime is 51979391. The next prime is 51979427. The reversal of 51979409 is 90497915.

It is a balanced prime because it is at equal distance from previous prime (51979391) and next prime (51979427).

It can be written as a sum of positive squares in only one way, i.e., 41319184 + 10660225 = 6428^2 + 3265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51979409 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51979409.

It is not a weakly prime, because it can be changed into another prime (51979429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25989704 + 25989705.

It is an arithmetic number, because the mean of its divisors is an integer number (25989705).

Almost surely, 2^51979409 is an apocalyptic number.

It is an amenable number.

51979409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51979409 is an equidigital number, since it uses as much as digits as its factorization.

51979409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 51979409 is about 7209.6746805941. The cubic root of 51979409 is about 373.2018424228.

The spelling of 51979409 in words is "fifty-one million, nine hundred seventy-nine thousand, four hundred nine".