1200715121 has 2 divisors, whose sum is σ = 1200715122. Its totient is φ = 1200715120.

The previous prime is 1200715111. The next prime is 1200715129. The reversal of 1200715121 is 1215170021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786185521 + 414529600 = 28039^2 + 20360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200715121 - 2⁶ = 1200715057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200715093 and 1200715102.

It is not a weakly prime, because it can be changed into another prime (1200715129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600357560 + 600357561.

It is an arithmetic number, because the mean of its divisors is an integer number (600357561).

Almost surely, 2^1200715121 is an apocalyptic number.

It is an amenable number.

1200715121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200715121 is an equidigital number, since it uses as much as digits as its factorization.

1200715121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 1200715121 is about 34651.3364965913. The cubic root of 1200715121 is about 1062.8696187806.

Adding to 1200715121 its reverse (1215170021), we get a palindrome (2415885142).

The spelling of 1200715121 in words is "one billion, two hundred million, seven hundred fifteen thousand, one hundred twenty-one".