1201512001 has 2 divisors, whose sum is σ = 1201512002. Its totient is φ = 1201512000.

The previous prime is 1201511999. The next prime is 1201512017. The reversal of 1201512001 is 1002151021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 758451600 + 443060401 = 27540^2 + 21049^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201512001 - 2¹ = 1201511999 is a prime.

Together with 1201511999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1201512031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600756000 + 600756001.

It is an arithmetic number, because the mean of its divisors is an integer number (600756001).

Almost surely, 2^1201512001 is an apocalyptic number.

It is an amenable number.

1201512001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201512001 is an equidigital number, since it uses as much as digits as its factorization.

1201512001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1201512001 is about 34662.8331357955. The cubic root of 1201512001 is about 1063.1046987547.

Adding to 1201512001 its reverse (1002151021), we get a palindrome (2203663022).

The spelling of 1201512001 in words is "one billion, two hundred one million, five hundred twelve thousand, one".