1200512105 has 16 divisors (see below), whose sum is σ = 1552282704. Its totient is φ = 886045440.

The previous prime is 1200512099. The next prime is 1200512111. The reversal of 1200512105 is 5012150021.

It is an interprime number because it is at equal distance from previous prime (1200512099) and next prime (1200512111).

It can be written as a sum of positive squares in 8 ways, for example, as 245454889 + 955057216 = 15667^2 + 30904^2 .

It is not a de Polignac number, because 1200512105 - 2⁶ = 1200512041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150887 + ... + 158643.

It is an arithmetic number, because the mean of its divisors is an integer number (97017669).

Almost surely, 2^1200512105 is an apocalyptic number.

It is an amenable number.

1200512105 is a deficient number, since it is larger than the sum of its proper divisors (351770599).

1200512105 is a wasteful number, since it uses less digits than its factorization.

1200512105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1200512105 is about 34648.4069619369. The cubic root of 1200512105 is about 1062.8097123417.

Adding to 1200512105 its reverse (5012150021), we get a palindrome (6212662126).

The spelling of 1200512105 in words is "one billion, two hundred million, five hundred twelve thousand, one hundred five".