51645767 has 2 divisors, whose sum is σ = 51645768. Its totient is φ = 51645766.

The previous prime is 51645731. The next prime is 51645791. The reversal of 51645767 is 76754615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51645767 - 2⁶ = 51645703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51645707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822883 + 25822884.

It is an arithmetic number, because the mean of its divisors is an integer number (25822884).

Almost surely, 2^51645767 is an apocalyptic number.

51645767 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645767 is an equidigital number, since it uses as much as digits as its factorization.

51645767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 41.

The square root of 51645767 is about 7186.4989389827. The cubic root of 51645767 is about 372.4016334112.

The spelling of 51645767 in words is "fifty-one million, six hundred forty-five thousand, seven hundred sixty-seven".