51645793 has 2 divisors, whose sum is σ = 51645794. Its totient is φ = 51645792.

The previous prime is 51645791. The next prime is 51645817. The reversal of 51645793 is 39754615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46949904 + 4695889 = 6852^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 51645793 - 2¹ = 51645791 is a prime.

Together with 51645791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51645791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822896 + 25822897.

It is an arithmetic number, because the mean of its divisors is an integer number (25822897).

Almost surely, 2^51645793 is an apocalyptic number.

It is an amenable number.

51645793 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645793 is an equidigital number, since it uses as much as digits as its factorization.

51645793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The square root of 51645793 is about 7186.5007479301. The cubic root of 51645793 is about 372.4016959038.

The spelling of 51645793 in words is "fifty-one million, six hundred forty-five thousand, seven hundred ninety-three".