51801427 has 4 divisors (see below), whose sum is σ = 51828336. Its totient is φ = 51774520.

The previous prime is 51801419. The next prime is 51801479. The reversal of 51801427 is 72410815.

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 51801427 - 2³ = 51801419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51801395 and 51801404.

It is not an unprimeable number, because it can be changed into a prime (51802427) 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, 10324 + ... + 14497.

It is an arithmetic number, because the mean of its divisors is an integer number (12957084).

Almost surely, 2^51801427 is an apocalyptic number.

51801427 is a deficient number, since it is larger than the sum of its proper divisors (26909).

51801427 is a wasteful number, since it uses less digits than its factorization.

51801427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26908.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51801427 is about 7197.3208209722. The cubic root of 51801427 is about 372.7753968418.

The spelling of 51801427 in words is "fifty-one million, eight hundred one thousand, four hundred twenty-seven".