51121803 has 8 divisors (see below), whose sum is σ = 68257600. Its totient is φ = 34033608.

The previous prime is 51121781. The next prime is 51121823. The reversal of 51121803 is 30812115.

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

It is not a de Polignac number, because 51121803 - 2¹⁶ = 51056267 is a prime.

It is a super-2 number, since 2×51121803² = 5226877483941618, 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 51121803.

It is not an unprimeable number, because it can be changed into a prime (51121823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9313 + ... + 13746.

It is an arithmetic number, because the mean of its divisors is an integer number (8532200).

Almost surely, 2^51121803 is an apocalyptic number.

51121803 is a deficient number, since it is larger than the sum of its proper divisors (17135797).

51121803 is a wasteful number, since it uses less digits than its factorization.

51121803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23801.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 51121803 is about 7149.9512585751. The cubic root of 51121803 is about 371.1379695748.

Adding to 51121803 its reverse (30812115), we get a palindrome (81933918).

The spelling of 51121803 in words is "fifty-one million, one hundred twenty-one thousand, eight hundred three".