51775729 has 2 divisors, whose sum is σ = 51775730. Its totient is φ = 51775728.

The previous prime is 51775709. The next prime is 51775751. The reversal of 51775729 is 92757715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35129329 + 16646400 = 5927^2 + 4080^2 .

It is a cyclic number.

It is not a de Polignac number, because 51775729 - 2⁵ = 51775697 is a prime.

It is a super-2 number, since 2×51775729² = 5361452226962882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51775709) 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, 25887864 + 25887865.

It is an arithmetic number, because the mean of its divisors is an integer number (25887865).

Almost surely, 2^51775729 is an apocalyptic number.

It is an amenable number.

51775729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51775729 is an equidigital number, since it uses as much as digits as its factorization.

51775729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 154350, while the sum is 43.

The square root of 51775729 is about 7195.5353518692. The cubic root of 51775729 is about 372.7137436710.

The spelling of 51775729 in words is "fifty-one million, seven hundred seventy-five thousand, seven hundred twenty-nine".