51101801 has 4 divisors (see below), whose sum is σ = 51116100. Its totient is φ = 51087504.

The previous prime is 51101797. The next prime is 51101803. The reversal of 51101801 is 10810115.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 39677401 + 11424400 = 6299^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 51101801 - 2² = 51101797 is a prime.

It is a super-2 number, since 2×51101801² = 5222788130887202, 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 51101801.

It is not an unprimeable number, because it can be changed into a prime (51101803) 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 3 ways as a sum of consecutive naturals, for example, 3455 + ... + 10683.

It is an arithmetic number, because the mean of its divisors is an integer number (12779025).

Almost surely, 2^51101801 is an apocalyptic number.

It is an amenable number.

51101801 is a deficient number, since it is larger than the sum of its proper divisors (14299).

51101801 is an equidigital number, since it uses as much as digits as its factorization.

51101801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14298.

The product of its (nonzero) digits is 40, while the sum is 17.

The square root of 51101801 is about 7148.5523709350. The cubic root of 51101801 is about 371.0895592449.

Adding to 51101801 its reverse (10810115), we get a palindrome (61911916).

The spelling of 51101801 in words is "fifty-one million, one hundred one thousand, eight hundred one".