51010010001 has 12 divisors (see below), whose sum is σ = 73686775812. Its totient is φ = 34004065536.

The previous prime is 51010009997. The next prime is 51010010021. The reversal of 51010010001 is 10001001015.

It can be written as a sum of positive squares in 2 ways, for example, as 39820601601 + 11189408400 = 199551^2 + 105780^2 .

It is not a de Polignac number, because 51010010001 - 2² = 51010009997 is a prime.

It is a super-2 number, since 2×51010010001² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (51010010021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89476 + ... + 331701.

It is an arithmetic number, because the mean of its divisors is an integer number (6140564651).

Almost surely, 2^51010010001 is an apocalyptic number.

It is an amenable number.

51010010001 is a deficient number, since it is larger than the sum of its proper divisors (22676765811).

51010010001 is a wasteful number, since it uses less digits than its factorization.

51010010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434640 (or 434637 counting only the distinct ones).

The product of its (nonzero) digits is 5, while the sum is 9.

Adding to 51010010001 its reverse (10001001015), we get a palindrome (61011011016).

The spelling of 51010010001 in words is "fifty-one billion, ten million, ten thousand, one".