51509426 has 4 divisors (see below), whose sum is σ = 77264142. Its totient is φ = 25754712.

The previous prime is 51509389. The next prime is 51509429. The reversal of 51509426 is 62490515.

It is a happy number.

51509426 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.

It can be written as a sum of positive squares in only one way, i.e., 48790225 + 2719201 = 6985^2 + 1649^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51509392 and 51509401.

It is not an unprimeable number, because it can be changed into a prime (51509429) 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 as a sum of consecutive naturals, namely, 12877355 + ... + 12877358.

Almost surely, 2^51509426 is an apocalyptic number.

51509426 is a deficient number, since it is larger than the sum of its proper divisors (25754716).

51509426 is a wasteful number, since it uses less digits than its factorization.

51509426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25754715.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 51509426 is about 7177.0067576950. The cubic root of 51509426 is about 372.0736403718.

The spelling of 51509426 in words is "fifty-one million, five hundred nine thousand, four hundred twenty-six".