51144819 has 8 divisors (see below), whose sum is σ = 74392512. Its totient is φ = 30996840.

The previous prime is 51144811. The next prime is 51144833. The reversal of 51144819 is 91844115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51144819 - 2³ = 51144811 is a prime.

It is a super-2 number, since 2×51144819² = 5231585021085522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1549843 = 51144819 / (5 + 1 + 1 + 4 + 4 + 8 + 1 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 51144819.

It is not an unprimeable number, because it can be changed into a prime (51144811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774889 + ... + 774954.

It is an arithmetic number, because the mean of its divisors is an integer number (9299064).

Almost surely, 2^51144819 is an apocalyptic number.

51144819 is a deficient number, since it is larger than the sum of its proper divisors (23247693).

51144819 is a wasteful number, since it uses less digits than its factorization.

51144819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549857.

The product of its digits is 5760, while the sum is 33.

The square root of 51144819 is about 7151.5605989183. The cubic root of 51144819 is about 371.1936589897.

The spelling of 51144819 in words is "fifty-one million, one hundred forty-four thousand, eight hundred nineteen".