51806477 has 4 divisors (see below), whose sum is σ = 52579776. Its totient is φ = 51033180.

The previous prime is 51806467. The next prime is 51806509. The reversal of 51806477 is 77460815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51806477 - 2²⁰ = 50757901 is a prime.

It is a super-2 number, since 2×51806477² = 5367822118303058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51806477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51806437) 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, 386549 + ... + 386682.

It is an arithmetic number, because the mean of its divisors is an integer number (13144944).

Almost surely, 2^51806477 is an apocalyptic number.

It is an amenable number.

51806477 is a deficient number, since it is larger than the sum of its proper divisors (773299).

51806477 is an equidigital number, since it uses as much as digits as its factorization.

51806477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773298.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 51806477 is about 7197.6716374116. The cubic root of 51806477 is about 372.7875101155.

The spelling of 51806477 in words is "fifty-one million, eight hundred six thousand, four hundred seventy-seven".