51745091 has 2 divisors, whose sum is σ = 51745092. Its totient is φ = 51745090.

The previous prime is 51745087. The next prime is 51745103. The reversal of 51745091 is 19054715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51745091 - 2² = 51745087 is a prime.

It is not a weakly prime, because it can be changed into another prime (51745021) 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, 25872545 + 25872546.

It is an arithmetic number, because the mean of its divisors is an integer number (25872546).

Almost surely, 2^51745091 is an apocalyptic number.

51745091 is a deficient number, since it is larger than the sum of its proper divisors (1).

51745091 is an equidigital number, since it uses as much as digits as its factorization.

51745091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 51745091 is about 7193.4060777910. The cubic root of 51745091 is about 372.6402120693.

The spelling of 51745091 in words is "fifty-one million, seven hundred forty-five thousand, ninety-one".