1000051001 has 4 divisors (see below), whose sum is σ = 1000318452. Its totient is φ = 999783552.

The previous prime is 1000050991. The next prime is 1000051009. The reversal of 1000051001 is 1001500001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1001500001 = 89 ⋅11252809.

It can be written as a sum of positive squares in 2 ways, for example, as 136866601 + 863184400 = 11699^2 + 29380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000051001 - 2¹⁰ = 1000049977 is a prime.

It is a super-2 number, since 2×1000051001² = 2000204009202204002, 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 1000051001.

It is not an unprimeable number, because it can be changed into a prime (1000051009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128036 + ... + 135621.

It is an arithmetic number, because the mean of its divisors is an integer number (250079613).

Almost surely, 2^1000051001 is an apocalyptic number.

It is an amenable number.

1000051001 is a deficient number, since it is larger than the sum of its proper divisors (267451).

1000051001 is an equidigital number, since it uses as much as digits as its factorization.

1000051001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267450.

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

The square root of 1000051001 is about 31623.5829880170. The cubic root of 1000051001 is about 1000.0170000443.

Adding to 1000051001 its reverse (1001500001), we get a palindrome (2001551002).

The spelling of 1000051001 in words is "one billion, fifty-one thousand, one".