51002000001 has 10 divisors (see below), whose sum is σ = 76188172962. Its totient is φ = 34001333280.

The previous prime is 51001999973. The next prime is 51002000069. The reversal of 51002000001 is 10000020015.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31451249025 + 19550750976 = 177345^2 + 139824^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51002000001 is a prime.

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 (51002000081) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 314827080 + ... + 314827241.

Almost surely, 2^51002000001 is an apocalyptic number.

It is an amenable number.

51002000001 is a deficient number, since it is larger than the sum of its proper divisors (25186172961).

51002000001 is an equidigital number, since it uses as much as digits as its factorization.

51002000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629654333 (or 629654324 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

Adding to 51002000001 its reverse (10000020015), we get a palindrome (61002020016).

The spelling of 51002000001 in words is "fifty-one billion, two million, one", and thus it is an aban number and an uban number.