51509677 has 4 divisors (see below), whose sum is σ = 54539676. Its totient is φ = 48479680.

The previous prime is 51509651. The next prime is 51509683. The reversal of 51509677 is 77690515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38303721 + 13205956 = 6189^2 + 3634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51509677 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51509687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514974 + ... + 1515007.

It is an arithmetic number, because the mean of its divisors is an integer number (13634919).

Almost surely, 2^51509677 is an apocalyptic number.

It is an amenable number.

51509677 is a deficient number, since it is larger than the sum of its proper divisors (3029999).

51509677 is a wasteful number, since it uses less digits than its factorization.

51509677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029998.

The product of its (nonzero) digits is 66150, while the sum is 40.

The square root of 51509677 is about 7177.0242440722. The cubic root of 51509677 is about 372.0742447294.

The spelling of 51509677 in words is "fifty-one million, five hundred nine thousand, six hundred seventy-seven".