51509427 has 8 divisors (see below), whose sum is σ = 68760720. Its totient is φ = 34298880.

The previous prime is 51509389. The next prime is 51509429. The reversal of 51509427 is 72490515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51509427 - 2⁶ = 51509363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51509429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7102 + ... + 12387.

It is an arithmetic number, because the mean of its divisors is an integer number (8595090).

Almost surely, 2^51509427 is an apocalyptic number.

51509427 is a deficient number, since it is larger than the sum of its proper divisors (17251293).

51509427 is a wasteful number, since it uses less digits than its factorization.

51509427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20373.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 51509427 is about 7177.0068273619. The cubic root of 51509427 is about 372.0736427796.

The spelling of 51509427 in words is "fifty-one million, five hundred nine thousand, four hundred twenty-seven".