51247729 has 12 divisors (see below), whose sum is σ = 56287872. Its totient is φ = 46628400.

The previous prime is 51247717. The next prime is 51247733. The reversal of 51247729 is 92774215.

It is not a de Polignac number, because 51247729 - 2⁷ = 51247601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51247709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9864 + ... + 14134.

It is an arithmetic number, because the mean of its divisors is an integer number (4690656).

Almost surely, 2^51247729 is an apocalyptic number.

It is an amenable number.

51247729 is a deficient number, since it is larger than the sum of its proper divisors (5040143).

51247729 is a wasteful number, since it uses less digits than its factorization.

51247729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4368 (or 4355 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The square root of 51247729 is about 7158.7519163608. The cubic root of 51247729 is about 371.4424554334.

The spelling of 51247729 in words is "fifty-one million, two hundred forty-seven thousand, seven hundred twenty-nine".