51739697 has 4 divisors (see below), whose sum is σ = 52082496. Its totient is φ = 51396900.

The previous prime is 51739693. The next prime is 51739711. The reversal of 51739697 is 79693715.

It is a happy number.

51739697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51739697 - 2² = 51739693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51739691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171173 + ... + 171474.

It is an arithmetic number, because the mean of its divisors is an integer number (13020624).

Almost surely, 2^51739697 is an apocalyptic number.

It is an amenable number.

51739697 is a deficient number, since it is larger than the sum of its proper divisors (342799).

51739697 is a wasteful number, since it uses less digits than its factorization.

51739697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342798.

The product of its digits is 357210, while the sum is 47.

The square root of 51739697 is about 7193.0311413200. The cubic root of 51739697 is about 372.6272633940.

The spelling of 51739697 in words is "fifty-one million, seven hundred thirty-nine thousand, six hundred ninety-seven".