51000101 has 4 divisors (see below), whose sum is σ = 51105312. Its totient is φ = 50894892.

The previous prime is 51000083. The next prime is 51000113. The reversal of 51000101 is 10100015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10100015 = 5 ⋅2020003.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51000101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51002101) 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, 51875 + ... + 52848.

It is an arithmetic number, because the mean of its divisors is an integer number (12776328).

Almost surely, 2^51000101 is an apocalyptic number.

It is an amenable number.

51000101 is a deficient number, since it is larger than the sum of its proper divisors (105211).

51000101 is a wasteful number, since it uses less digits than its factorization.

51000101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105210.

The product of its (nonzero) digits is 5, while the sum is 8.

The square root of 51000101 is about 7141.4354999538. The cubic root of 51000101 is about 370.8432217313.

Adding to 51000101 its reverse (10100015), we get a palindrome (61100116).

The spelling of 51000101 in words is "fifty-one million, one hundred one", and thus it is an aban number.