51609427 has 4 divisors (see below), whose sum is σ = 51823816. Its totient is φ = 51395040.

The previous prime is 51609419. The next prime is 51609443. The reversal of 51609427 is 72490615.

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

It is a cyclic number.

It is not a de Polignac number, because 51609427 - 2³ = 51609419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51609392 and 51609401.

It is not an unprimeable number, because it can be changed into a prime (51609457) 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, 106833 + ... + 107314.

It is an arithmetic number, because the mean of its divisors is an integer number (12955954).

Almost surely, 2^51609427 is an apocalyptic number.

51609427 is a deficient number, since it is larger than the sum of its proper divisors (214389).

51609427 is a wasteful number, since it uses less digits than its factorization.

51609427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214388.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 51609427 is about 7183.9701419201. The cubic root of 51609427 is about 372.3142674209.

The spelling of 51609427 in words is "fifty-one million, six hundred nine thousand, four hundred twenty-seven".