1200000051 has 12 divisors (see below), whose sum is σ = 1734015712. Its totient is φ = 799685136.

The previous prime is 1200000041. The next prime is 1200000059. The reversal of 1200000051 is 1500000021.

It is a happy number.

It is not a de Polignac number, because 1200000051 - 2⁷ = 1199999923 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1199999979 and 1200000042.

It is not an unprimeable number, because it can be changed into a prime (1200000059) 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, 811 + ... + 48996.

Almost surely, 2^1200000051 is an apocalyptic number.

1200000051 is a deficient number, since it is larger than the sum of its proper divisors (534015661).

1200000051 is a wasteful number, since it uses less digits than its factorization.

1200000051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52490 (or 52487 counting only the distinct ones).

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

The square root of 1200000051 is about 34641.0168874991. The cubic root of 1200000051 is about 1062.6585842369.

Adding to 1200000051 its reverse (1500000021), we get a palindrome (2700000072).

The spelling of 1200000051 in words is "one billion, two hundred million, fifty-one", and thus it is an aban number.