51138953 has 2 divisors, whose sum is σ = 51138954. Its totient is φ = 51138952.

The previous prime is 51138943. The next prime is 51139001. The reversal of 51138953 is 35983115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 273529 = 7132^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 51138953 - 2⁸ = 51138697 is a prime.

It is not a weakly prime, because it can be changed into another prime (51138943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569476 + 25569477.

It is an arithmetic number, because the mean of its divisors is an integer number (25569477).

Almost surely, 2^51138953 is an apocalyptic number.

It is an amenable number.

51138953 is a deficient number, since it is larger than the sum of its proper divisors (1).

51138953 is an equidigital number, since it uses as much as digits as its factorization.

51138953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 51138953 is about 7151.1504668829. The cubic root of 51138953 is about 371.1794672280.

The spelling of 51138953 in words is "fifty-one million, one hundred thirty-eight thousand, nine hundred fifty-three".