51397013 has 2 divisors, whose sum is σ = 51397014. Its totient is φ = 51397012.

The previous prime is 51396979. The next prime is 51397051. The reversal of 51397013 is 31079315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45670564 + 5726449 = 6758^2 + 2393^2 .

It is a cyclic number.

It is not a de Polignac number, because 51397013 - 2⁶ = 51396949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51397813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25698506 + 25698507.

It is an arithmetic number, because the mean of its divisors is an integer number (25698507).

Almost surely, 2^51397013 is an apocalyptic number.

It is an amenable number.

51397013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51397013 is an equidigital number, since it uses as much as digits as its factorization.

51397013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2835, while the sum is 29.

The square root of 51397013 is about 7169.1710120487. The cubic root of 51397013 is about 371.8027748819.

The spelling of 51397013 in words is "fifty-one million, three hundred ninety-seven thousand, thirteen".