51390617 has 2 divisors, whose sum is σ = 51390618. Its totient is φ = 51390616.

The previous prime is 51390587. The next prime is 51390629. The reversal of 51390617 is 71609315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40208281 + 11182336 = 6341^2 + 3344^2 .

It is a cyclic number.

It is not a de Polignac number, because 51390617 - 2¹⁰ = 51389593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51396617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25695308 + 25695309.

It is an arithmetic number, because the mean of its divisors is an integer number (25695309).

Almost surely, 2^51390617 is an apocalyptic number.

It is an amenable number.

51390617 is a deficient number, since it is larger than the sum of its proper divisors (1).

51390617 is an equidigital number, since it uses as much as digits as its factorization.

51390617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 51390617 is about 7168.7249214906. The cubic root of 51390617 is about 371.7873514876.

The spelling of 51390617 in words is "fifty-one million, three hundred ninety thousand, six hundred seventeen".