51402203 has 4 divisors (see below), whose sum is σ = 54425880. Its totient is φ = 48378528.

The previous prime is 51402193. The next prime is 51402251. The reversal of 51402203 is 30220415.

51402203 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51402203 - 2⁴ = 51402187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 3023659 = 51402203 / (5 + 1 + 4 + 0 + 2 + 2 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51402283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511813 + ... + 1511846.

It is an arithmetic number, because the mean of its divisors is an integer number (13606470).

Almost surely, 2^51402203 is an apocalyptic number.

51402203 is a deficient number, since it is larger than the sum of its proper divisors (3023677).

51402203 is a wasteful number, since it uses less digits than its factorization.

51402203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023676.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 51402203 is about 7169.5329694479. The cubic root of 51402203 is about 371.8152891724.

Adding to 51402203 its reverse (30220415), we get a palindrome (81622618).

The spelling of 51402203 in words is "fifty-one million, four hundred two thousand, two hundred three".