1281000122 has 16 divisors (see below), whose sum is σ = 2020350600. Its totient is φ = 608274240.

The previous prime is 1281000109. The next prime is 1281000163. The reversal of 1281000122 is 2210001821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 805367641 + 475632481 = 28379^2 + 21809^2 .

It is a super-2 number, since 2×1281000122² = 3281922625128029768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1281000122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177497 + ... + 184572.

Almost surely, 2^1281000122 is an apocalyptic number.

1281000122 is a deficient number, since it is larger than the sum of its proper divisors (739350478).

1281000122 is a wasteful number, since it uses less digits than its factorization.

1281000122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362161.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1281000122 is about 35791.0620406827. The cubic root of 1281000122 is about 1086.0497593494.

Adding to 1281000122 its reverse (2210001821), we get a palindrome (3491001943).

The spelling of 1281000122 in words is "one billion, two hundred eighty-one million, one hundred twenty-two", and thus it is an aban number.