51816379 has 4 divisors (see below), whose sum is σ = 51965200. Its totient is φ = 51667560.

The previous prime is 51816377. The next prime is 51816397. The reversal of 51816379 is 97361815.

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 51816379 - 2¹ = 51816377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51816377) 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, 73887 + ... + 74584.

It is an arithmetic number, because the mean of its divisors is an integer number (12991300).

Almost surely, 2^51816379 is an apocalyptic number.

51816379 is a deficient number, since it is larger than the sum of its proper divisors (148821).

51816379 is a wasteful number, since it uses less digits than its factorization.

51816379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148820.

The product of its digits is 45360, while the sum is 40.

The square root of 51816379 is about 7198.3594658783. The cubic root of 51816379 is about 372.8112594417.

The spelling of 51816379 in words is "fifty-one million, eight hundred sixteen thousand, three hundred seventy-nine".