51515001101 has 4 divisors (see below), whose sum is σ = 51987615900. Its totient is φ = 51042386304.

The previous prime is 51515001089. The next prime is 51515001103. The reversal of 51515001101 is 10110051515.

51515001101 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 can be written as a sum of positive squares in 2 ways, for example, as 15432099076 + 36082902025 = 124226^2 + 189955^2 .

It is a cyclic number.

It is not a de Polignac number, because 51515001101 - 2²² = 51510806797 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 (51515001103) 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, 236307236 + ... + 236307453.

It is an arithmetic number, because the mean of its divisors is an integer number (12996903975).

Almost surely, 2^51515001101 is an apocalyptic number.

It is an amenable number.

51515001101 is a deficient number, since it is larger than the sum of its proper divisors (472614799).

51515001101 is a wasteful number, since it uses less digits than its factorization.

51515001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472614798.

The product of its (nonzero) digits is 125, while the sum is 20.

Adding to 51515001101 its reverse (10110051515), we get a palindrome (61625052616).

The spelling of 51515001101 in words is "fifty-one billion, five hundred fifteen million, one thousand, one hundred one".