51649997 has 4 divisors (see below), whose sum is σ = 59028576. Its totient is φ = 44271420.

The previous prime is 51649951. The next prime is 51650033. The reversal of 51649997 is 79994615.

51649997 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 51649997 - 2⁶ = 51649933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649907) 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, 3689279 + ... + 3689292.

It is an arithmetic number, because the mean of its divisors is an integer number (14757144).

Almost surely, 2^51649997 is an apocalyptic number.

It is an amenable number.

51649997 is a deficient number, since it is larger than the sum of its proper divisors (7378579).

51649997 is an equidigital number, since it uses as much as digits as its factorization.

51649997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378578.

The product of its digits is 612360, while the sum is 50.

The square root of 51649997 is about 7186.7932348162. The cubic root of 51649997 is about 372.4118002070.

The spelling of 51649997 in words is "fifty-one million, six hundred forty-nine thousand, nine hundred ninety-seven".