51020105 has 4 divisors (see below), whose sum is σ = 61224132. Its totient is φ = 40816080.

The previous prime is 51020083. The next prime is 51020107. The reversal of 51020105 is 50102015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50102015 = 5 ⋅10020403.

It can be written as a sum of positive squares in 2 ways, for example, as 28590409 + 22429696 = 5347^2 + 4736^2 .

It is not a de Polignac number, because 51020105 - 2⁶ = 51020041 is a prime.

It is a super-2 number, since 2×51020105² = 5206102228422050, 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 51020105.

It is not an unprimeable number, because it can be changed into a prime (51020107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5102006 + ... + 5102015.

It is an arithmetic number, because the mean of its divisors is an integer number (15306033).

Almost surely, 2^51020105 is an apocalyptic number.

It is an amenable number.

51020105 is a deficient number, since it is larger than the sum of its proper divisors (10204027).

51020105 is a wasteful number, since it uses less digits than its factorization.

51020105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10204026.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 51020105 is about 7142.8359213970. The cubic root of 51020105 is about 370.8917012308.

It can be divided in two parts, 5102010 and 5, that added together give a palindrome (5102015).

The spelling of 51020105 in words is "fifty-one million, twenty thousand, one hundred five".