51985207 has 2 divisors, whose sum is σ = 51985208. Its totient is φ = 51985206.

The previous prime is 51985163. The next prime is 51985211. The reversal of 51985207 is 70258915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51985207 - 2⁷ = 51985079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51985217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25992603 + 25992604.

It is an arithmetic number, because the mean of its divisors is an integer number (25992604).

Almost surely, 2^51985207 is an apocalyptic number.

51985207 is a deficient number, since it is larger than the sum of its proper divisors (1).

51985207 is an equidigital number, since it uses as much as digits as its factorization.

51985207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 51985207 is about 7210.0767679686. The cubic root of 51985207 is about 373.2157180700.

The spelling of 51985207 in words is "fifty-one million, nine hundred eighty-five thousand, two hundred seven".