51813473 has 4 divisors (see below), whose sum is σ = 51839940. Its totient is φ = 51787008.

The previous prime is 51813451. The next prime is 51813479. The reversal of 51813473 is 37431815.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38651089 + 13162384 = 6217^2 + 3628^2 .

It is a cyclic number.

It is not a de Polignac number, because 51813473 - 2¹² = 51809377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51813479) 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, 10040 + ... + 14297.

It is an arithmetic number, because the mean of its divisors is an integer number (12959985).

Almost surely, 2^51813473 is an apocalyptic number.

It is an amenable number.

51813473 is a deficient number, since it is larger than the sum of its proper divisors (26467).

51813473 is a wasteful number, since it uses less digits than its factorization.

51813473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26466.

The product of its digits is 10080, while the sum is 32.

The square root of 51813473 is about 7198.1576115003. The cubic root of 51813473 is about 372.8042898966.

The spelling of 51813473 in words is "fifty-one million, eight hundred thirteen thousand, four hundred seventy-three".